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>

arch/powerpc/include/asm/qe.h

@@ -196,7 +196,7 @@ static inline int qe_alive_during_sleep(void)
 
 /* Structure that defines QE firmware binary files.
  *
- * See Documentation/powerpc/qe-firmware.txt for a description of these
+ * See Documentation/powerpc/qe_firmware.txt for a description of these
  * fields.
  */
 struct qe_firmware {