Merge bitcoin/bitcoin#29548: doc: remove rel note fragments

6e5eda8 doc: remove rel note fragments (fanquake)

Pull request description:

  These have been added to https://github.com/bitcoin-core/bitcoin-devwiki/wiki/27.0-Release-Notes-Draft, where they can be improved further.

ACKs for top commit:
  stickies-v:
    ACK 6e5eda8

Tree-SHA512: 66874fe9a64ac3a99a15a602ac68ae0a9e08f52a0fe732e48136b245c2127ed04e8217f86c44459696b03b01532a926ab8d41101c6e670902c1fc31e583b4dc9

Author: fanquake