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/mtd/Kconfig b/drivers/mtd/Kconfig
index 4be8373..66b616e 100644
--- a/drivers/mtd/Kconfig
+++ b/drivers/mtd/Kconfig
@@ -142,7 +142,7 @@
 	help
 	  This provides a partition parsing function which derives
 	  the partition map from the children of the flash node,
-	  as described in Documentation/powerpc/booting-without-of.txt.
+	  as described in Documentation/devicetree/booting-without-of.txt.
 
 config MTD_AR7_PARTS
 	tristate "TI AR7 partitioning support"