perldelta.pod: Fix GitHub references

Fixes #21170

pod/perldelta.pod

@@ -378,15 +378,15 @@ These features will be entirely removed from perl in v5.42.0.
 
 Additional optree optimizations for common OP patterns. For example, multiple
 simple OPs replaced by a single streamlined OP, so as to be more efficient at
-runtime. L<[GH #19943]|https://github.com/Perl/perl5/pull/19943>,
-L<[GH #20063]|https://github.com/Perl/perl5/pull/20063>,
-L<[GH #20077]|https://github.com/Perl/perl5/pull/20077>.
+runtime. [L<GH #19943|https://github.com/Perl/perl5/pull/19943>],
+[L<GH #20063|https://github.com/Perl/perl5/pull/20063>],
+[L<GH #20077|https://github.com/Perl/perl5/pull/20077>].
 
 =item *
 
 Creating an anonymous sub no longer generates an C<srefgen> op, the
 reference generation is now done in the C<anoncode> or C<anonconst>
-op, saving runtime.  [github #20290]
+op, saving runtime. [L<GH #20290|https://github.com/Perl/perl5/pull/20290>]
 
 =back
 
@@ -398,11 +398,11 @@ op, saving runtime.  [github #20290]
 
 =item *
 
-Added the C<is_tainted()> builtin function. [L<github #19854|https://github.com/Perl/perl5/issues/19854>]
+Added the C<is_tainted()> builtin function. [L<GH #19854|https://github.com/Perl/perl5/issues/19854>]
 
 =item *
 
-Added the C<export_lexically()> builtin function as per L<PPC 0020|https://github.com/Perl/PPCs/blob/main/ppcs/ppc0020-lexical-export.md>. [L<github #19895|https://github.com/Perl/perl5/issues/19895>]
+Added the C<export_lexically()> builtin function as per L<PPC 0020|https://github.com/Perl/PPCs/blob/main/ppcs/ppc0020-lexical-export.md>. [L<GH #19895|https://github.com/Perl/perl5/issues/19895>]
 
 =item *
 
@@ -1509,7 +1509,7 @@ L<Smartmatch is deprecated|perldiag/"Smartmatch is deprecated"> replaces C<Smart
 
 C<make -j6 minitest> could fail due to a build conflict in building
 C<$(MINIPERL_EXE)> between the main make process and a child process.
-[github #19829]
+[L<GH #19829|https://github.com/Perl/perl5/issues/19829>]
 
 =item *
 
@@ -1592,14 +1592,16 @@ machines.  Its final release was in 1995.
 
 =item DragonflyBSD
 
-Skip tests to workaround an apparent bug in setproctitle().  [L<github #19894|https://github.com/Perl/perl5/issues/19894>]
+Skip tests to workaround an apparent bug in C<setproctitle()>.
+[L<GH #19894|https://github.com/Perl/perl5/issues/19894>]
 
 =item FreeBSD
 
 FreeBSD no longer uses thread-safe locale operations, to avoid L<a bug in
 FreeBSD|https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265950>
 
-Replace the first part of archname with `uname -p` [L<github #19791|https://github.com/Perl/perl5/issues/19791>]
+Replace the first part of archname with C<uname -p>
+[L<GH #19791|https://github.com/Perl/perl5/issues/19791>]
 
 =item Solaris
 
@@ -1614,28 +1616,34 @@ Update Synology Readme for DSM 7.
 Fix win32 memory alignment needed for gcc-12 from vmem.h.
 
 utimes() on Win32 would print a message to stderr if it failed to
-convert a supplied C<time_t> to to a C<FILETIME>. [github #19668]
+convert a supplied C<time_t> to to a C<FILETIME>.
+[L<GH #19668|https://github.com/Perl/perl5/issues/19668>]
 
 In some cases, timestamps returned by L<stat()|perlfunc/stat> and
 L<lstat()|perlfunc/lstat> failed to take daylight saving time into account.
 [L<GH #20018|https://github.com/Perl/perl5/issues/20018>]
 [L<GH #20061|https://github.com/Perl/perl5/issues/20061>]
 
-stat() now works on AF_UNIX socket files. [github #20204]
+stat() now works on C<AF_UNIX> socket files.
+[L<GH #20204|https://github.com/Perl/perl5/issues/20204>]
 
 readlink() now returns the C<PrintName> from a symbolic link reparse
 point instead of the C<SubstituteName>, which should make it better
-match the name the link was created with.  [github #20271]
+match the name the link was created with.
+[L<GH #20271|https://github.com/Perl/perl5/pull/20271>]
 
 lstat() on Windows now returns the length of the link target as the
-size of the file, as it does on POSIX systems.  [github #20476]
+size of the file, as it does on POSIX systems.
+[L<GH #20476|https://github.com/Perl/perl5/issues/20476>]
 
 symlink() on Windows now replaces any C</> in the target with C<\>,
 since Windows does not recognise C</> in symbolic links.  The reverse
-translation is B<not> done by readlink().  [github #20506]
+translation is B<not> done by readlink().
+[L<GH #20506|https://github.com/Perl/perl5/issues/20506>]
 
 symlink() where the target was an absolute path to a directory was
-incorrectly created as a file symbolic link.  [github #20533]
+incorrectly created as a file symbolic link.
+[L<GH #20533|https://github.com/Perl/perl5/issues/20533>]
 
 C<POSIX::dup2> no longer creates broken sockets. [L<GH
 #20920|https://github.com/Perl/perl5/issues/20920>]
@@ -1875,7 +1883,7 @@ value will not be magical.
 The C<SSNEW()>, C<SSNEWt()>, C<SSNEWa()> and C<SSNEWat()> APIs now
 return a C<SSize_t> value.  The C<SSPTR()> and C<SSPTRt()> macros now
 expect a C<SSize_t> parameter, and enforce that on debugging builds.
-[github #20411]
+[L<GH #20411|https://github.com/Perl/perl5/issues/20411>]
 
 =item *
 
@@ -1973,7 +1981,7 @@ interpreter panic; e.g.
 =item *
 
 Disabling the C<bareword_filehandles> feature no longer treats C<< print
-Class->method >> as an error.  [L<github #19704|https://github.com/Perl/perl5/issues/19704>]
+Class->method >> as an error.  [L<GH #19704|https://github.com/Perl/perl5/issues/19704>]
 
 =item *
 
@@ -1988,34 +1996,35 @@ In addition, where the Perl subroutine is freed at the same time:
 this formerly could lead to crashes if the XS subroutine tried to use the
 value of C<PL_op>, since this was being set to NULL. This is now fixed.
 
-[L<github #19936|https://github.com/Perl/perl5/issues/19936>]
+[L<GH #19936|https://github.com/Perl/perl5/issues/19936>]
 
 =item *
 
 setsockopt() now uses the mechanism added in 5.36 to better
 distinguish between numeric and string values supplied as the
-C<OPTVAL> parameter.  [L<github #18761|https://github.com/Perl/perl5/issues/18761>]
+C<OPTVAL> parameter.  [L<GH #18761|https://github.com/Perl/perl5/issues/18761>]
 
 =item *
 
 4-argument C<select()> now rejects strings with code points above
 255. Additionally, for code points 128-255, this operator will now always
 give the corresponding octet to the OS, regardless of how Perl stores
 such code points in memory. (Previously Perl leaked its internal string
-storage to the OS.) [L<github #19882|https://github.com/Perl/perl5/issues/19882>]
+storage to the OS.) [L<GH #19882|https://github.com/Perl/perl5/issues/19882>]
 
 =item *
 
-Fix panic issue from C<val {} inside /(?{...})/> [L<github #19390|https://github.com/Perl/perl5/issues/19390>]
+Fix panic issue from C<val {} inside /(?{...})/> [L<GH #19390|https://github.com/Perl/perl5/issues/19390>]
 
 =item *
 
-Fix multiple compiler warnings from regexp.c., locale.c [L<github #19915|https://github.com/Perl/perl5/issues/19915>]
+Fix multiple compiler warnings from F<regexp.c>, F<locale.c>
+[L<GH #19915|https://github.com/Perl/perl5/issues/19915>]
 
 =item *
 
 Fix a bug with querying locales on platforms that don't have C<LC_NUMERIC>
-[L<github #19890|https://github.com/Perl/perl5/issues/19890>]
+[L<GH #19890|https://github.com/Perl/perl5/issues/19890>]
 
 =item *
 
@@ -2057,7 +2066,7 @@ switch wouldn't be freed.
 
 Correctly handle C<OP_ANONCODE> ops generated by CPAN modules that
 don't include the OPf_REF flag when propagating lvalue context.
-L<[GH #20532]|https://github.com/Perl/perl5/pull/20532>
+[L<GH #20532|https://github.com/Perl/perl5/pull/20532>]
 
 =item *
 
@@ -2078,7 +2087,7 @@ input is returned unchanged.
 Double FETCH during stringification of tied scalars returning an
 overloaded object have been fixed. The FETCH method should only be
 called once, but prior to this release was actually called twice.
-L<[GH #20574]|https://github.com/Perl/perl5/pull/20574>
+[L<GH #20574|https://github.com/Perl/perl5/pull/20574>]
 
 =item *