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/include/linux/io-mapping.h b/include/linux/io-mapping.h
index 8cdcc2a1..c81ed2a 100644
--- a/include/linux/io-mapping.h
+++ b/include/linux/io-mapping.h
@@ -27,7 +27,7 @@
  * The io_mapping mechanism provides an abstraction for mapping
  * individual pages from an io device to the CPU in an efficient fashion.
  *
- * See Documentation/io_mapping.txt
+ * See Documentation/io-mapping.txt
  */
 
 #ifdef CONFIG_HAVE_ATOMIC_IOMAP
diff --git a/include/linux/isdn.h b/include/linux/isdn.h
index 44cd663..4ccf95d 100644
--- a/include/linux/isdn.h
+++ b/include/linux/isdn.h
@@ -68,7 +68,7 @@
 #define ISDN_NET_ENCAP_SYNCPPP    4
 #define ISDN_NET_ENCAP_UIHDLC     5
 #define ISDN_NET_ENCAP_CISCOHDLCK 6 /* With SLARP and keepalive    */
-#define ISDN_NET_ENCAP_X25IFACE   7 /* Documentation/networking/x25-iface.txt*/
+#define ISDN_NET_ENCAP_X25IFACE   7 /* Documentation/networking/x25-iface.txt */
 #define ISDN_NET_ENCAP_MAX_ENCAP  ISDN_NET_ENCAP_X25IFACE
 
 /* Facility which currently uses an ISDN-channel */
diff --git a/include/linux/platform_data/ntc_thermistor.h b/include/linux/platform_data/ntc_thermistor.h
index abd2862..88734e8 100644
--- a/include/linux/platform_data/ntc_thermistor.h
+++ b/include/linux/platform_data/ntc_thermistor.h
@@ -36,7 +36,7 @@
 	 * read_uV()
 	 *
 	 * How to setup pullup_ohm, pulldown_ohm, and connect is
-	 * described at Documentation/hwmon/ntc
+	 * described at Documentation/hwmon/ntc_thermistor
 	 *
 	 * pullup/down_ohm: 0 for infinite / not-connected
 	 */
diff --git a/include/media/videobuf-dma-sg.h b/include/media/videobuf-dma-sg.h
index 1c647e8..d8fb601 100644
--- a/include/media/videobuf-dma-sg.h
+++ b/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 ...)
  *
diff --git a/include/target/configfs_macros.h b/include/target/configfs_macros.h
index 7fe7460..a0fc85b 100644
--- a/include/target/configfs_macros.h
+++ b/include/target/configfs_macros.h
@@ -30,8 +30,8 @@
  * Added CONFIGFS_EATTR() macros from original configfs.h macros
  * Copright (C) 2008-2009 Nicholas A. Bellinger <nab@linux-iscsi.org>
  *
- * Please read Documentation/filesystems/configfs.txt before using the
- * configfs interface, ESPECIALLY the parts about reference counts and
+ * Please read Documentation/filesystems/configfs/configfs.txt before using
+ * the configfs interface, ESPECIALLY the parts about reference counts and
  * item destructors.
  */