perlmod: change the ' deprecation note to mention the feature

Author: tonycoz

pod/perlmod.pod

@@ -81,8 +81,12 @@ the $s variable in package C<owner>, which is probably not what you meant.
 Use braces to disambiguate, as in C<"This is ${owner}'s house">.
 X<::> X<'>
 
-Using C<'> as a package separator is deprecated and will be removed in
-Perl 5.40.
+
+Use of C<'> as a package delimiter can be disabled with:
+
+  no feature 'apostrophe_as_package_separator';
+
+and is also disabled by C<use v5.42;> or later.
 
 Packages may themselves contain package separators, as in
 C<$OUTER::INNER::var>.  This implies nothing about the order of