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>

common/cmd_mii.c

@@ -460,5 +460,5 @@ U_BOOT_CMD(
 	"mii read   <addr> <reg>        - read  MII PHY <addr> register <reg>\n"
 	"mii write  <addr> <reg> <data> - write MII PHY <addr> register <reg>\n"
 	"mii dump   <addr> <reg>        - pretty-print <addr> <reg> (0-5 only)\n"
-	"Addr and/or reg may be ranges, e.g. 2-7.\n"
+	"Addr and/or reg may be ranges, e.g. 2-7."
 );