Remove full stop in the 'try' feature heading

None of the other headings in feature.pm have full stops.

Author: ilmari

lib/feature.pm

@@ -856,7 +856,7 @@ =head2 The 'bareword_filehandles' feature
 You can use the L<bareword::filehandles> module on CPAN to disable
 bareword filehandles for older versions of perl.
 
-=head2 The 'try' feature.
+=head2 The 'try' feature
 
 B<WARNING>: This feature is still experimental and the implementation may
 change or be removed in future versions of Perl.  For this reason, Perl will