Merge bitcoin/bitcoin#29025: doc: Add link to needs-release-notes label

fa88953 doc: Add link to needs-release-notes label (MarcoFalke)

Pull request description:

  This makes it easier to spot and not forget. C.f. bitcoin/bitcoin#28597 (comment)

ACKs for top commit:
  kristapsk:
    ACK fa88953
  TheCharlatan:
    ACK fa88953

Tree-SHA512: 28336cde36d62622d1b6627497291cbd4644bf1e4e6f17dc9cde39f254e7094dd02484da754e45558e59facb20941dd0c049ce7b33dcc62bfec6c26c16516cdf

Author: fanquake

doc/release-process.md

@@ -74,7 +74,9 @@ Release Process
 #### Before final release
 
 - Merge the release notes from [the wiki](https://github.com/bitcoin-core/bitcoin-devwiki/wiki/) into the branch.
-- Ensure the "Needs release note" label is removed from all relevant pull requests and issues.
+- Ensure the "Needs release note" label is removed from all relevant pull
+  requests and issues:
+  https://github.com/bitcoin/bitcoin/issues?q=label%3A%22Needs+release+note%22
 
 #### Tagging a release (candidate)