perl5300delta: fix link to perldeprecation

Extra whitespace in L<> results in an invalid link.

Author: Grinnz

pod/perl5300delta.pod

@@ -215,8 +215,8 @@ by default, JSON::PP also enabled allow_nonref by default.
 
 This deprecation was scheduled to become fatal in 5.30, but has been
 delayed to 5.32 due to problems that showed up with some CPAN modules.
-For details of what's affected, see L<perldeprecation|
-perldeprecation/In XS code, use of various macros dealing with UTF-8.>.
+For details of what's affected, see
+L<perldeprecation|perldeprecation/In XS code, use of various macros dealing with UTF-8.>.
 
 =head1 Performance Enhancements