Command usage cleanup

Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/common/cmd_doc.c b/common/cmd_doc.c
index f139d42..e2d4a42 100644
--- a/common/cmd_doc.c
+++ b/common/cmd_doc.c
@@ -191,7 +191,7 @@
 }
 U_BOOT_CMD(
 	doc,	5,	1,	do_doc,
-	"doc     - Disk-On-Chip sub-system\n",
+	"Disk-On-Chip sub-system",
 	"info  - show available DOC devices\n"
 	"doc device [dev] - show or set current device\n"
 	"doc read  addr off size\n"
@@ -337,7 +337,7 @@
 
 U_BOOT_CMD(
 	docboot,	4,	1,	do_docboot,
-	"docboot - boot from DOC device\n",
+	"boot from DOC device",
 	"loadAddr dev\n"
 );