[0.20.2] rc3, (missing) release notes and backport #22900

1. 
   fanquake commented at 6:39 am on September 6, 2021: member

   This adds missing 0.20.0 and 0.20.1 release notes to the 0.20 branch, as well as release notes for 0.20.2, and backports #22837. The version is bumped to rc3 for the purpose of having one last, short, rc, before potentially cutting what should be the final release on the 0.20.0 branch.
2. doc: mention bech32m/BIP350 in doc/descriptors.md

   Github-Pull: #22837
   Rebased-From: d2a09c83554cec864a27e704cf2a0d513691a567

   2b986b3f07
3. doc: add historical release notes for 0.20.0 6b643b9fe5
4. doc: add historical release notes for 0.20.1 5f97738722
5. doc: update release notes for rc3 0712b04359
6. build: bump version to 0.20.2rc3 88178b1d30
7. DrahtBot added the label Backport on Sep 6, 2021
8. 
   MarcoFalke commented at 10:14 am on September 6, 2021: member

   cr ACK 88178b1d30990e420a4c1ae2dfd42b09ec1fd252
9. MarcoFalke merged this on Sep 6, 2021
10. MarcoFalke closed this on Sep 6, 2021

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11. fanquake deleted the branch on Sep 6, 2021
12. tcharding referenced this in commit cf5d3734fa on Jul 22, 2022
13. DrahtBot locked this on Sep 6, 2022

Contributors
fanquake MarcoFalke

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Backport