perlretut: Rmove obsolete caution about \G

Fixes #17674

Author: khwilliamson

pod/perlretut.pod

@@ -1710,8 +1710,6 @@ off.  C<\G> allows us to easily do context-sensitive matching:
 
 The combination of C</g> and C<\G> allows us to process the string a
 bit at a time and use arbitrary Perl logic to decide what to do next.
-Currently, the C<\G> anchor is only fully supported when used to anchor
-to the start of the pattern.
 
 C<\G> is also invaluable in processing fixed-length records with
 regexps.  Suppose we have a snippet of coding region DNA, encoded as