Merge bitcoin/bitcoin#31387: doc: Use more precise anchor link to codesigning docs

19f49c7 doc: Use more precise anchor link to codesigning docs (Jeremy Rand)

Pull request description:

  The "Codesigning" section is what users presumably are looking for when they follow this link.

ACKs for top commit:
  fanquake:
    ACK 19f49c7

Tree-SHA512: 0e25cf0d7160db7d564d67d3e3ac614f9bd209b2399414f1278fa01cfc1ff827aa8311f7c1c2666924d5ac2dc23fe9bc258b80ed8025d5b8d5b11bcf1d12b28c

Author: fanquake

contrib/guix/README.md

@@ -68,7 +68,7 @@ following from the top of a clean repository:
 
 The `guix-codesign` command attaches codesignatures (produced by codesigners) to
 existing non-codesigned outputs. Please see the [release process
-documentation](/doc/release-process.md) for more context.
+documentation](/doc/release-process.md#codesigning) for more context.
 
 It respects many of the same environment variable flags as `guix-build`, with 2
 crucial differences: