Changes link as indicated, closes #2170

Also reflows, puts anchors above titles, and rewrites the pull request entry (decapitalizing second word)

Author: JJ

doc/Language/glossary.pod6

@@ -819,25 +819,26 @@ X<|Perl>
 
 The Perl programming language in its many forms.
 
-=head1 PERL
 X<|PERL>
+=head1 PERL
 
-A way to describe L<Perl|#Perl> as a language, considered to be improper by
-many in the L<Perl Community|/language/community>.
+A way to describe L<Perl|#Perl> as a language, considered to be improper
+by many in the L<Perl Community|/language/community>.
 
-=head1 POD
 X<|POD>
+=head1 POD
 
-B<P>lain B<O>l' B<D>ocumentation, a documentation format understood by Perl 6. See L<S26|https://design.perl6.org/S26.html> for details.
+B<P>lain B<O>l' B<D>ocumentation, a documentation format understood by
+Perl 6. See L<S26|/language/pod>.
 
-=head1 Pull Request
-X<|Pull Request>
+X<|Pull request>
+=head1 Pull request
 
-A feature of L<https://github.com> that allows you to make patches
-to be easily applied using the Github user interface. It means you
-request someone to do a git pull from your L<repository|#Repository> to hers. In
-GitHub, it can be done automatically through the web  interface. PR is
-its usual acronym.
+A feature of L<GitHub|https://github.com> and other git hosts like
+L<GitLab|https://gitlab.com> that allows you to make patches to be
+easily applied using the GitHub web user interface. It means you request
+someone to do a git pull from your L<repository|#Repository> to hers. PR
+is its usual acronym.
 
 =head1 property