Check for L<foo|foo>

Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3117)

util/find-doc-nits

@@ -160,6 +160,8 @@ sub check()
         if $contents =~ /=head1 NAME.*\.\n.*=head1 SYNOPSIS/ms;
     print "$id POD markup in NAME section\n"
         if $contents =~ /=head1 NAME.*[<>].*=head1 SYNOPSIS/ms;
+    print "$id Duplicate $1 in L<>\n"
+        if $contents =~ /L<([^>]*)\|([^>]*)>/ && $1 eq $2;
 
     # Look for multiple consecutive openssl #include lines.
     # Consecutive because of files like md5.pod. Sometimes it's okay