feature: Document origins of class, keyword_any, keyword_all

Author: mvuets

regen/feature.pl

@@ -1067,6 +1067,8 @@ =head2 The 'class' feature
 This feature enables the C<class> block syntax and other associated keywords
 which implement the "new" object system, previously codenamed "Corinna".
 
+This feature is available starting in Perl 5.38.
+
 =head2 The 'apostrophe_as_package_separator' feature
 
 This feature enables use C<'> (apostrophe) as an alternative to using
@@ -1091,6 +1093,8 @@ =head2 The 'keyword_any' feature
 This allow testing whether any of the values in a list satisfy a given
 condition, with short-circuiting behaviour as soon as it finds one.
 
+This feature is available starting in Perl 5.42.
+
 =head2 The 'keyword_all' feature
 
 B<WARNING>: This feature is still experimental and the implementation may
@@ -1104,6 +1108,8 @@ =head2 The 'keyword_all' feature
 condition, with short-circuiting behaviour as soon as it finds one that does
 not.
 
+This feature is available starting in Perl 5.42.
+
 =head1 FEATURE BUNDLES
 
 It's possible to load multiple features together, using