Fix typos in Documentation/: 'N'-'P'

This patch fixes typos in various Documentation txts. The patch addresses
some words starting with the letters 'N'-'P'.

Signed-off-by: Matt LaPlante <kernel1@cyberdogtech.com>
Acked-by: Randy Dunlap <rdunlap@xenotime.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/filesystems/spufs.txt b/Documentation/filesystems/spufs.txt
index 302df12..3889a80 100644
--- a/Documentation/filesystems/spufs.txt
+++ b/Documentation/filesystems/spufs.txt
@@ -359,7 +359,7 @@
        EFAULT npc is not a valid pointer or status is neither NULL nor a valid
               pointer.
 
-       EINTR  A signal occured while spu_run was in progress.  The  npc  value
+       EINTR  A signal occurred while spu_run was in progress.  The npc  value
               has  been updated to the new program counter value if necessary.
 
        EINVAL fd is not a file descriptor returned from spu_create(2).