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/isdn/INTERFACE.fax b/Documentation/isdn/INTERFACE.fax
index 7e57313..9c8c6d9 100644
--- a/Documentation/isdn/INTERFACE.fax
+++ b/Documentation/isdn/INTERFACE.fax
@@ -26,7 +26,7 @@
   If the HL-driver receives ISDN_CMD_FAXCMD, all needed information
   is in this struct set by the LL.
   To signal information to the LL, the HL-driver has to set the 
-  the parameters and use ISDN_STAT_FAXIND.
+  parameters and use ISDN_STAT_FAXIND.
   (Please refer to INTERFACE)
 
 Structure T30_s: