W1: feature, w1_therm.c use strong pullup and documentation

Added strong pullup to thermal sensor driver and general documentation on
the sensor.

Signed-off-by: David Fries <david@fries.net>
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/w1/00-INDEX

@@ -1,5 +1,7 @@
 00-INDEX
 	- This file
+slaves/
+	- Drivers that provide support for specific family codes.
 masters/
 	- Individual chips providing 1-wire busses.
 w1.generic