General help message cleanup

Many of the help messages were not really helpful; for example, many
commands that take no arguments would not print a correct synopsis
line, but "No additional help available." which is not exactly wrong,
but not helpful either.

Commit ``Make "usage" messages more helpful.'' changed this
partially. But it also became clear that lots of "Usage" and "Help"
messages (fields "usage" and "help" in struct cmd_tbl_s respective)
were actually redundant.

This patch cleans this up - for example:

Before:
	=> help dtt
	dtt - Digital Thermometer and Thermostat

	Usage:
	dtt         - Read temperature from digital thermometer and thermostat.

After:
	=> help dtt
	dtt - Read temperature from Digital Thermometer and Thermostat

	Usage:
	dtt

Signed-off-by: Wolfgang Denk <wd@denx.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/common/cmd_display.c b/common/cmd_display.c
index 4102424d14..34223952ee 100644
--- a/common/cmd_display.c
+++ b/common/cmd_display.c
@@ -74,5 +74,5 @@ U_BOOT_CMD(
 	"display string on dot matrix display",
 	"[<string>]\n"
 	"    - with <string> argument: display <string> on dot matrix display\n"
-	"    - without arguments: clear dot matrix display\n"
+	"    - without arguments: clear dot matrix display"
 );