watchdog: update/improve/consolidate watchdog driver

Move the limited watchdog driver help from kernel-parameters.txt
to Documentation/watchdog/watchdog-parameters.txt and add info to it
for all watchdog drivers except the ones that have driver-specific
files already.

Correct minor comments and MODULE_PARM_DESC() text in 2 places.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

diff --git a/Documentation/watchdog/00-INDEX b/Documentation/watchdog/00-INDEX
index c3ea47e..ee99451 100644
--- a/Documentation/watchdog/00-INDEX
+++ b/Documentation/watchdog/00-INDEX
@@ -1,10 +1,15 @@
 00-INDEX
 	- this file.
+hpwdt.txt
+	- information on the HP iLO2 NMI watchdog
 pcwd-watchdog.txt
 	- documentation for Berkshire Products PC Watchdog ISA cards.
 src/
 	- directory holding watchdog related example programs.
 watchdog-api.txt
 	- description of the Linux Watchdog driver API.
+watchdog-parameters.txt
+	- information on driver parameters (for drivers other than
+	  the ones that have driver-specific files here)
 wdt.txt
 	- description of the Watchdog Timer Interfaces for Linux.