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/pci-error-recovery.txt b/Documentation/pci-error-recovery.txt
index 634d3e5..6650af4 100644
--- a/Documentation/pci-error-recovery.txt
+++ b/Documentation/pci-error-recovery.txt
@@ -172,7 +172,7 @@
 >>> a value of 0xff on read, and writes will be dropped. If the device
 >>> driver attempts more than 10K I/O's to a frozen adapter, it will
 >>> assume that the device driver has gone into an infinite loop, and
->>> it will panic the the kernel. There doesn't seem to be any other
+>>> it will panic the kernel. There doesn't seem to be any other
 >>> way of stopping a device driver that insists on spinning on I/O.
 
 STEP 2: MMIO Enabled