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/exception.txt b/Documentation/exception.txt
index 3cb39ad..2d5aded 100644
--- a/Documentation/exception.txt
+++ b/Documentation/exception.txt
@@ -10,7 +10,7 @@
 function (which has since been replaced by access_ok()).
 
 This function verified that the memory area starting at address 
-addr and of size size was accessible for the operation specified 
+'addr' and of size 'size' was accessible for the operation specified
 in type (read or write). To do this, verify_read had to look up the 
 virtual memory area (vma) that contained the address addr. In the 
 normal case (correctly working program), this test was successful.