doc: add /spenttxouts to REST-interface.md #32842

1. 
   theStack commented at 9:29 pm on June 30, 2025: contributor

   Seems like adding the spenttxouts endpoint to the REST interface description was forgotten in #32540.
2. doc: add `/spenttxouts` to REST-interface.md dd99cedc0b
3. DrahtBot added the label Docs on Jun 30, 2025
4. 
   DrahtBot commented at 9:29 pm on June 30, 2025: contributor

   The following sections might be updated with supplementary metadata relevant to reviewers and maintainers.

   Code Coverage & Benchmarks

   For details see: https://corecheck.dev/bitcoin/bitcoin/pulls/32842.

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   ACK	pablomartin4btc, maflcko

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5. 
   pablomartin4btc commented at 9:54 pm on June 30, 2025: member

   ACK dd99cedc0bfe7d7eee0f543bb27dab005c426c66
6. 
   maflcko commented at 5:40 am on July 1, 2025: member

   lgtm ACK dd99cedc0bfe7d7eee0f543bb27dab005c426c66
7. fanquake merged this on Jul 1, 2025
8. fanquake closed this on Jul 1, 2025

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9. theStack deleted the branch on Jul 1, 2025
10. 
    romanz commented at 1:57 pm on July 1, 2025: contributor

    Thanks!

Contributors
theStack DrahtBot pablomartin4btc maflcko romanz

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