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/vm/numa b/Documentation/vm/numa
index 4b8db1b..e93ad94 100644
--- a/Documentation/vm/numa
+++ b/Documentation/vm/numa
@@ -22,7 +22,7 @@
 encapsulating all the pieces of information into a bootmem_data_t
 structure. Node specific calls have been added to the allocator. 
 In theory, any platform which uses the bootmem allocator should 
-be able to to put the bootmem and mem_map data structures anywhere
+be able to put the bootmem and mem_map data structures anywhere
 it deems best.
 
 Each node's page allocation data structures have also been encapsulated