fix wording slightly, say when the file changes (as a warning)..

stm32/update.sh

@@ -5,8 +5,8 @@ COD=$1
 if [ ! -d "$COD" ]; then
 	echo "usage: $0 <checkoutdir>"
 	echo ""
-	echo "checkoutdir is the directory where the STM32CubeXX files are"
-	echo "checked out."
+	echo "checkoutdir is the directory where the STM32CubeXX git repos"
+	echo "are."
 	exit 1
 fi
 
@@ -19,6 +19,9 @@ while read lclfn cube cubefn; do
 		err=1
 		continue
 	fi
+	if ! cmp -s "$cubefile" "$lclfn"; then
+		echo "updating $lclfn"
+	fi
 	cp "$cubefile" "$lclfn"
 	git add "$lclfn"
 done << EOF