Release process: formatting.

wiki/src/contribute/APT_repository/custom.mdwn

@@ -332,7 +332,7 @@ If you just put out a final release:
 
 * [[merge `stable` or `testing` into
   `devel`|APT_repository/custom#workflow-merge-main-branch]]
-* increment the version number in devel's `debian/changelog` to match
+* increment the version number in `devel`'s `debian/changelog` to match
   the next major release, so that
   next builds from the `devel` branch do not use the APT suite meant
   for the last release: