perldelta - Remove backticks

(Spotted by mauke)

pod/perldelta.pod

@@ -75,12 +75,12 @@ fixing [L<GH #19198|https://github.com/Perl/perl5/issues/19198>].
 
 =item *
 
-Fixed an issue where `utf8n_to_uvchr` failed to correctly identify certain
+Fixed an issue where C<utf8n_to_uvchr()> failed to correctly identify certain
 invalid UTF-8 sequences as invalid.  Specifically, sequences that start with
 continuation bytes or unassigned bytes could cause unexpected behaviour or a
 panic.  This fix ensures that such invalid sequences are now properly detected
 and handled.  This correction also resolves related issues in modules that
-handle UTF-8 processing, such as `Encode.pm`.
+handle UTF-8 processing, such as L<Encode>.
 
 =item *