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/board/mpl/mip405/cmd_mip405.c b/board/mpl/mip405/cmd_mip405.c
index dc13804..cd93a7c 100644
--- a/board/mpl/mip405/cmd_mip405.c
+++ b/board/mpl/mip405/cmd_mip405.c
@@ -60,7 +60,7 @@
 	"mip405 flash mps - updates U-Boot with image from MPS\n"
 	"mip405 info      - displays board information\n"
 	"mip405 led <on>  - switches LED on (on=1) or off (on=0)\n"
-	"mip405 mem [cnt] - Memory Test <cnt>-times, <cnt> = -1 loop forever\n"
+	"mip405 mem [cnt] - Memory Test <cnt>-times, <cnt> = -1 loop forever"
 );
 
 /* ------------------------------------------------------------------------- */
diff --git a/board/mpl/pati/cmd_pati.c b/board/mpl/pati/cmd_pati.c
index 95bfdcc..0682323 100644
--- a/board/mpl/pati/cmd_pati.c
+++ b/board/mpl/pati/cmd_pati.c
@@ -443,7 +443,7 @@
 	"    era   - erase PCI EEPROM (write all word to 0xffff)\n"
 	"    reload- Reload PCI Bridge with EEPROM Values\n"
 	"    NOTE: <addr> must start on word boundary\n"
-	"          <offset> and <size> must be even byte values\n"
+	"          <offset> and <size> must be even byte values"
 );
 
 /* ------------------------------------------------------------------------- */
diff --git a/board/mpl/pip405/cmd_pip405.c b/board/mpl/pip405/cmd_pip405.c
index ad5e0a1..6bbae89 100644
--- a/board/mpl/pip405/cmd_pip405.c
+++ b/board/mpl/pip405/cmd_pip405.c
@@ -63,7 +63,7 @@
 	"PIP405 specific Cmds",
 	"flash mem [SrcAddr] - updates U-Boot with image in memory\n"
 	"pip405 flash floppy [SrcAddr] - updates U-Boot with image from floppy\n"
-	"pip405 flash mps - updates U-Boot with image from MPS\n"
+	"pip405 flash mps - updates U-Boot with image from MPS"
 );
 
 /* ------------------------------------------------------------------------- */
diff --git a/board/mpl/vcma9/cmd_vcma9.c b/board/mpl/vcma9/cmd_vcma9.c
index cbe7fe2..0160774 100644
--- a/board/mpl/vcma9/cmd_vcma9.c
+++ b/board/mpl/vcma9/cmd_vcma9.c
@@ -174,5 +174,5 @@
 U_BOOT_CMD(
 	vcma9, 6, 1, do_vcma9,
 	"VCMA9 specific commands",
-	"flash mem [SrcAddr]\n    - updates U-Boot with image in memory\n"
+	"flash mem [SrcAddr]\n    - updates U-Boot with image in memory"
 );