[PATCH] [docs] Fix coverage doc typos and links.

[Sean Silva]

================
Comment at: docs/CoverageMappingFormat.rst:539
@@ -538,3 +538,3 @@
 
-A pseudo-counter is stored in a single `LEB value <LEB128_>`_, just like
 the ordinary counter. It has the following interpretation:
----------------
This just has an extra underscore and needs to be a `:ref:` (http://sphinx-doc.org/markup/inline.html#role-ref).

I.e. make this:

    :ref:`LEB value <LEB128>`

And similarly elsewhere. No need to rewrite the label names all over the document.

http://reviews.llvm.org/D9525

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