kernel-doc: Align quick help and the code

The update to the quick help mentions -Wshort-description, but
code never supported for that. Align that with the code by allowing
both: -Wshort-description and -Wshort-desc.

Fixes: 56b0f45 ("kernel-doc: don't let V=1 change outcome")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20231215150341.1996720-1-andriy.shevchenko@linux.intel.com

scripts/kernel-doc

@@ -23,7 +23,7 @@ kernel-doc - Print formatted kernel documentation to stdout
 
 =head1 SYNOPSIS
 
- kernel-doc [-h] [-v] [-Werror] [-Wall] [-Wreturn] [-Wshort-description] [-Wcontents-before-sections]
+ kernel-doc [-h] [-v] [-Werror] [-Wall] [-Wreturn] [-Wshort-desc[ription]] [-Wcontents-before-sections]
    [ -man |
      -rst [-sphinx-version VERSION] [-enable-lineno] |
      -none
@@ -328,7 +328,7 @@ while ($ARGV[0] =~ m/^--?(.*)/) {
 	$Werror = 1;
     } elsif ($cmd eq "Wreturn") {
 	$Wreturn = 1;
-    } elsif ($cmd eq "Wshort-desc") {
+    } elsif ($cmd eq "Wshort-desc" or $cmd eq "Wshort-description") {
 	$Wshort_desc = 1;
     } elsif ($cmd eq "Wcontents-before-sections") {
 	$Wcontents_before_sections = 1;