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/sysdev/qe_lib/qe.c

@@ -382,7 +382,7 @@ static void qe_upload_microcode(const void *base,
 /*
  * Upload a microcode to the I-RAM at a specific address.
  *
- * See Documentation/powerpc/qe-firmware.txt for information on QE microcode
+ * See Documentation/powerpc/qe_firmware.txt for information on QE microcode
  * uploading.
  *
  * Currently, only version 1 is supported, so the 'version' field must be