docs: sphinxify kcov.txt and move to dev-tools
Another document added to the dev-tools collection.
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: 
Jonathan Corbet <corbet@lwn.net>
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Another document added to the dev-tools collection.
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>