[PATCH] Fix a few typos and run-on sentences in the clang POD documentation.

[David Majnemer]

REPOSITORY
  rL LLVM

================
Comment at: docs/tools/clang.pod:392
@@ -391,3 +391,3 @@
 
-Don't emit warning for unused driver arguments.
+Don't emit any warning for unused driver arguments.
 
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I think this would read better as:
> Don't emit any warnings for unused driver arguments.

http://reviews.llvm.org/D10234

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