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/arch/parisc/include/asm/dma-mapping.h b/arch/parisc/include/asm/dma-mapping.h
index 890531e..467bbd5 100644
--- a/arch/parisc/include/asm/dma-mapping.h
+++ b/arch/parisc/include/asm/dma-mapping.h
@@ -5,7 +5,7 @@
 #include <asm/cacheflush.h>
 #include <asm/scatterlist.h>
 
-/* See Documentation/PCI/PCI-DMA-mapping.txt */
+/* See Documentation/DMA-API-HOWTO.txt */
 struct hppa_dma_ops {
 	int  (*dma_supported)(struct device *dev, u64 mask);
 	void *(*alloc_consistent)(struct device *dev, size_t size, dma_addr_t *iova, gfp_t flag);