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<!-- DFIN New ActiveDisclosure (SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2026-09-28T12:39:31.9290+00:00 -->
<!-- Copyright (c) 2026 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_IfWeDefaultOnOurObligationsToPayOurOtherIndebtednessWeMayNotBeAbleToMakePaymentsOnTheNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">If We Default On Our Obligations To Pay Our Other Indebtedness, We May Not Be Able To Make Payments On The Notes [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_IfWeDefaultOnOurObligationsToPayOurOtherIndebtednessWeMayNotBeAbleToMakePaymentsOnTheNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">If we default on our obligations to pay our other indebtedness, we may not be able to make payments on the Notes.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_CommonStockOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Common Stock One</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_CommonStockOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common Stock 1 [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_CommonStockOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common Stock</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_TheNotesWillBeStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The Notes Will Be Structurally Subordinated To The Indebtedness And Other Liabilities Of Our Subsidiaries [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_TheNotesWillBeStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">The Notes Will Be Structurally Subordinated To The Indebtedness And Other Liabilities Of Our Subsidiaries [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_TheNotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessWeHaveCurrentlyIncurredOrMayIncurInTheFutureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">The Notes Will Be Unsecured And Therefore Will Be Effectively Subordinated To Any Secured Indebtedness We Have Currently Incurred Or May Incur In The Future [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_TheNotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessWeHaveCurrentlyIncurredOrMayIncurInTheFutureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The Notes will be unsecured and therefore will be effectively subordinated to any secured indebtedness we have currently incurred or may incur in the future.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_OurCreditRatingsMayNotReflectAllRisksOfAnInvestmentInTheNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Our credit ratings may not reflect all risks of an investment in the Notes.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_OurCreditRatingsMayNotReflectAllRisksOfAnInvestmentInTheNotesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Our Credit Ratings May Not Reflect All Risks Of An Investment In The Notes [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_CreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Credit Facility [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_CreditFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Credit Facility.</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_SeniorNotesTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Senior notes two thousand twenty six.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_SeniorNotesTwoThousandTwentySixMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2026 Notes</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_OurSharesOfCommonStockHaveTradedAtADiscountFromNetAssetValueAndMayDoSoInTheFutureWhichCouldLimitOurAbilityToRaiseAdditionalEquityCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Our Shares Of Common Stock Have Traded At A Discount From Net Asset Value And May Do So In The Future, Which Could Limit Our Ability To Raise Additional Equity Capital [Member]</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_OurSharesOfCommonStockHaveTradedAtADiscountFromNetAssetValueAndMayDoSoInTheFutureWhichCouldLimitOurAbilityToRaiseAdditionalEquityCapitalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Our Shares Of Common Stock Have Traded At A Discount From Net Asset Value And May Do So In The Future, Which Could Limit Our Ability To Raise Additional Equity Capital [Member]</link:label>
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          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_NotesMayBeSubjectToGreaterPriceVolatilityThanRatedNotesInActiveTradingMarketAndParticularlySimilarSecuritiesWithAnInvestmentGradeRatingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">An active trading market for the Notes does not currently exist and may not develop, which could limit a holder's ability to sell the Notes or affect the market price of the Notes. Moreover, if the Notes are no longer rated, the Notes may be subject to greater price volatility than rated notes and particularly similar securities with an investment grade rating.</link:label>
          <link:label xml:lang="en-US" xlink:type="resource" xlink:label="rway_NotesMayBeSubjectToGreaterPriceVolatilityThanRatedNotesInActiveTradingMarketAndParticularlySimilarSecuritiesWithAnInvestmentGradeRatingMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">An Active Trading Market For The Notes Does Not Currently Exist And May Not Develop Which Could Limit A Holder's Ability To Sell The Notes Or Affect The Market Price Of The Notes Moreover If The Notes Are No Longer Rated The Notes May Be Subject To Greater Price Volatility Than Rated Notes And Particularly Similar Securities With An Investment Grade Rating [Member]</link:label>
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