Documentation: remove duplicated words

Remove many duplicated words under Documentation/ and do other small
cleanups.

Examples:
        "and and" --> "and"
        "in in" --> "in"
        "the the" --> "the"
        "the the" --> "to the"
        ...

Signed-off-by: Paolo Ornati <ornati@fastwebnet.it>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index cd07c21..7737bfd 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -410,7 +410,7 @@
 
   put_link: called by the VFS to release resources allocated by
   	follow_link().  The cookie returned by follow_link() is passed
-  	to to this method as the last parameter.  It is used by
+  	to this method as the last parameter.  It is used by
   	filesystems such as NFS where page cache is not stable
   	(i.e. page that was installed when the symbolic link walk
   	started might not be in the page cache at the end of the