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/input/input.txt b/Documentation/input/input.txt
index fabb823..ff8cea0 100644
--- a/Documentation/input/input.txt
+++ b/Documentation/input/input.txt
@@ -230,7 +230,7 @@
 API is still evolving, but should be useable now. It's described in
 section 5. 
 
-  This should be the way for GPM and X to get keyboard and mouse mouse
+  This should be the way for GPM and X to get keyboard and mouse
 events. It allows for multihead in X without any specific multihead
 kernel support. The event codes are the same on all architectures and
 are hardware independent.