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/DocBook/usb.tmpl b/Documentation/DocBook/usb.tmpl
index fbc72d4..143e5ff 100644
--- a/Documentation/DocBook/usb.tmpl
+++ b/Documentation/DocBook/usb.tmpl
@@ -740,7 +740,7 @@
 		<title>Synchronous I/O Support</title>
 
 		<para>Synchronous requests involve the kernel blocking
-		until until the user mode request completes, either by
+		until the user mode request completes, either by
 		finishing successfully or by reporting an error.
 		In most cases this is the simplest way to use usbfs,
 		although as noted above it does prevent performing I/O