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/usb/hiddev.txt b/Documentation/usb/hiddev.txt
index cd6fb4b..6a79075 100644
--- a/Documentation/usb/hiddev.txt
+++ b/Documentation/usb/hiddev.txt
@@ -118,7 +118,7 @@
 HIDIOCGDEVINFO - struct hiddev_devinfo (read)
 Gets a hiddev_devinfo structure which describes the device.
 
-HIDIOCGSTRING - struct struct hiddev_string_descriptor (read/write)
+HIDIOCGSTRING - struct hiddev_string_descriptor (read/write)
 Gets a string descriptor from the device. The caller must fill in the
 "index" field to indicate which descriptor should be returned.