cmd: Kconfig: Fix typos

fix the following typos
- from "categorys" to "categories"
- from "indivdually" to "individually"

Signed-off-by: Aristo Chen <aristo.chen@canonical.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@kernel.org>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 2d31abc..f21d27c 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -5,7 +5,7 @@
 	  Enable U-Boot's command-line functions. This provides a means
 	  to enter commands into U-Boot for a wide variety of purposes. It
 	  also allows scripts (containing commands) to be executed.
-	  Various commands and command categorys can be indivdually enabled.
+	  Various commands and command categories can be individually enabled.
 	  Depending on the number of commands enabled, this can add
 	  substantially to the size of U-Boot.