kernel-doc: drop looking for "MACDOC"

Linux kernel does not use "MACDOC" in any documenation or any
source files, so stop searching for it.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240108003700.13418-1-rdunlap@infradead.org

scripts/kernel-doc

@@ -1907,7 +1907,7 @@ sub process_proto_function($$) {
 
     $x =~ s@\/\/.*$@@gos; # strip C99-style comments to end of line
 
-    if ($x =~ m#\s*/\*\s+MACDOC\s*#io || ($x =~ /^#/ && $x !~ /^#\s*define/)) {
+    if ($x =~ /^#/ && $x !~ /^#\s*define/) {
 	# do nothing
     }
     elsif ($x =~ /([^\{]*)/) {