Warning about old word boundary markers in regexes #2632

Author: JJ

doc/Language/regexes.pod6

@@ -1109,7 +1109,8 @@ two leading spaces each.
 To match any word boundary, use C«<|w>» or C«<?wb>». This is similar to
 X«C<\b>|regex deprecated,\b» in other languages. To match the opposite, any
 character that is not bounding a word, use C«<!|w>» or C«<!wb>». This is similar
-to X«C<\B>|regex deprecated,\B» in other languages.
+to X«C<\B>|regex deprecated,\B» in other languages; C<\b> and C<\B> will
+throw an L<C<X::Obsolete>|/type/X::Obsolete> exception from version 6.d of Raku.
 
 These are both zero-width regex elements.