scripts: get_abi.pl: Fix typo in help message

Fix misspelled word in the script. (s/COMAND/COMMAND/).
Reviewed-by: NMauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: NMichal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/1ff3605db3dead41bbde33fbbff6754900eceead.1645789205.git.michal.simek@xilinx.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

scripts/get_abi.pl

@@ -988,7 +988,7 @@ abi_book.pl - parse the Linux ABI files and produce a ReST book.
 B<abi_book.pl> [--debug <level>] [--enable-lineno] [--man] [--help]
 	       [--(no-)rst-source] [--dir=<dir>] [--show-hints]
 	       [--search-string <regex>]
-	       <COMAND> [<ARGUMENT>]
+	       <COMMAND> [<ARGUMENT>]
 
 Where B<COMMAND> can be: