scripts/get_abi: change the file/line number meta info

In order to make it more standard and ReST compatible,
change the meta-tag used with --enable-lineno from:

	#define LINENO

to
	.. LINENO

In practice, no functional changes.

Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Link: https://lore.kernel.org/r/125ffd31fbc77ad9eee4d6906e1830b8162fa6ca.1648290305.git.mchehab@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/scripts/get_abi.pl b/scripts/get_abi.pl
index 6212f58b..25836ac 100755
--- a/scripts/get_abi.pl
+++ b/scripts/get_abi.pl
@@ -326,7 +326,7 @@
 		my @filepath = split / /, $data{$what}->{filepath};
 
 		if ($enable_lineno) {
-			printf "#define LINENO %s%s#%s\n\n",
+			printf ".. LINENO %s%s#%s\n\n",
 			       $prefix, $file[0],
 			       $data{$what}->{line_no};
 		}
@@ -1022,7 +1022,7 @@
 
 =item B<--enable-lineno>
 
-Enable output of #define LINENO lines.
+Enable output of .. LINENO lines.
 
 =item B<--debug> I<debug level>