cmd: mmc: modify more readable about hwpartition usage

Modified more readable about hwpartition usage.
Because it's difficult to understand how to use its command.
The arguments didn't optional.
mmc hwpartition needs to pass <USER> <GP> <MODE> as arguments.
Description about each arguments what is required is the below:
 USER - <user> <enh> <start> <cnt> <wrrel> <{on|off}>
 GP   - <{gp1|gp2|gp3|gp4}> <cnt> <enh> <wrrel> <{on|off}>
 MODE - <{check|set|complete}>

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
diff --git a/cmd/mmc.c b/cmd/mmc.c
index cb6b59f..c1c00d0 100644
--- a/cmd/mmc.c
+++ b/cmd/mmc.c
@@ -1008,11 +1008,14 @@
 	"mmc list - lists available devices\n"
 	"mmc wp - power on write protect boot partitions\n"
 #if CONFIG_IS_ENABLED(MMC_HW_PARTITIONING)
-	"mmc hwpartition [args...] - does hardware partitioning\n"
+	"mmc hwpartition <USER> <GP> <MODE> - does hardware partitioning\n"
 	"  arguments (sizes in 512-byte blocks):\n"
-	"    [user [enh start cnt] [wrrel {on|off}]] - sets user data area attributes\n"
-	"    [gp1|gp2|gp3|gp4 cnt [enh] [wrrel {on|off}]] - general purpose partition\n"
-	"    [check|set|complete] - mode, complete set partitioning completed\n"
+	"   USER - <user> <enh> <start> <cnt> <wrrel> <{on|off}>\n"
+	"	: sets user data area attributes\n"
+	"   GP - <{gp1|gp2|gp3|gp4}> <cnt> <enh> <wrrel> <{on|off}>\n"
+	"	: general purpose partition\n"
+	"   MODE - <{check|set|complete}>\n"
+	"	: mode, complete set partitioning completed\n"
 	"  WARNING: Partitioning is a write-once setting once it is set to complete.\n"
 	"  Power cycling is required to initialize partitions after set to complete.\n"
 #endif