cmd: fix typo in CMD_BOOTMETH help text

It's bootmeths and not bootmethds.

Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index ff0f594..a2dee34 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -308,7 +308,7 @@
 	depends on BOOTSTD
 	default y if BOOTSTD_FULL
 	help
-	  Support listing available bootmethds (methods used to boot an
+	  Support listing available bootmeths (methods used to boot an
 	  Operating System), as well as selecting the order that the bootmeths
 	  are used.