Correct POD for release managers document:

xsawyerx · xsawyerx · commit 9e08bfd8d1a9 · 2016-05-19T22:01:57.000+02:00
A literal / (solidus) is E&lt;sol&gt;.
diff --git a/Porting/release_managers_guide.pod b/Porting/release_managers_guide.pod
@@ -243,7 +243,7 @@ necessary, fix things up. For example, you might think that both blead
 and maint are synchronised with a particular CPAN module, but one might
 have some extra changes.
 
-=head3 How to sync a CPAN module with a cpan/ distro
+=head3 How to sync a CPAN module with a cpanE<sol> distro
 
 =over 4
 
