scripts/kernel-doc: don't add not needed new lines

This helps comparing kernel-doc output with the new .py version
of it.

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Link: https://lore.kernel.org/r/6b036ef7d746f26d7d0044626b04d1f0880a2188.1740387599.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <[email protected]>

Author: mchehab

scripts/kernel-doc

@@ -760,6 +760,10 @@ sub output_highlight_rst {
     if ($block) {
         $output .= highlight_block($block);
     }
+
+    $output =~ s/^\n+//g;
+    $output =~ s/\n+$//g;
+
     foreach $line (split "\n", $output) {
         print $lineprefix . $line . "\n";
     }