doc: fix broken references

There are numerous broken references to Documentation files (in other
Documentation files, in comments, etc.). These broken references are
caused by typo's in the references, and by renames or removals of the
Documentation files. Some broken references are simply odd.

Fix these broken references, sometimes by dropping the irrelevant text
they were part of.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index b591e72..807c875 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -400,7 +400,7 @@
 	  This allows LEDs to be controlled by a programmable timer
 	  via sysfs. Some LED hardware can be programmed to start
 	  blinking the LED without any further software interaction.
-	  For more details read Documentation/leds-class.txt.
+	  For more details read Documentation/leds/leds-class.txt.
 
 	  If unsure, say Y.