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>
diff --git a/common/hush.c b/common/hush.c
index cf5782a..97fd070 100644
--- a/common/hush.c
+++ b/common/hush.c
@@ -3627,7 +3627,7 @@
 	"print local hushshell variables",
 	"\n    - print values of all hushshell variables\n"
 	"showvar name ...\n"
-	"    - print value of hushshell variable 'name'\n"
+	"    - print value of hushshell variable 'name'"
 );
 
 #endif