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>

include/media/videobuf-dma-sg.h

@@ -34,7 +34,7 @@
  *	does memory allocation too using vmalloc_32().
  *
  * videobuf_dma_*()
- *	see Documentation/PCI/PCI-DMA-mapping.txt, these functions to
+ *	see Documentation/DMA-API-HOWTO.txt, these functions to
  *	basically the same.  The map function does also build a
  *	scatterlist for the buffer (and unmap frees it ...)
  *