RMG - Link reference commit in section Bump the version number

Co-authored-by: Eric Herman <[email protected]>

Author: thibaultduponchelle

Porting/release_managers_guide.pod

@@ -561,7 +561,7 @@ Commit your changes:
  $ git commit -a -m 'Bump the perl version in various places for 5.X.Y'
 
 At this point you may want to compare the commit with a previous bump to
-see if they look similar.  See commit f7cf42bb69 for an example of a
+see if they look similar.  See commit L<f7cf42bb69|https://github.com/Perl/perl5/commit/f7cf42bb69> for an example of a
 previous version bump.
 
 When the version number is bumped, you should also update Module::CoreList
@@ -1539,7 +1539,7 @@ Commit your changes:
  $ git commit -a -m 'Bump the perl version in various places for 5.X.Y'
 
 At this point you may want to compare the commit with a previous bump to
-see if they look similar.  See commit f7cf42bb69 for an example of a
+see if they look similar.  See commit L<f7cf42bb69|https://github.com/Perl/perl5/commit/f7cf42bb69> for an example of a
 previous version bump.
 
 When the version number is bumped, you should also update Module::CoreList