docs/ControlRequirements.rst: formatting updated, time table added.

Signed-off-by: Konstantin Belov <konstantin.belov@gmail.com>
docs/AddingTest.rst: Markup update, mail list address added, deprecated part removed.

Signed-off-by: Konstantin Belov <konstantin.belov@gmail.com>
docs/AddingProfiler.rst: markup updated, mail list address added.

Signed-off-by: Konstantin Belov <konstantin.belov@gmail.com>
docs/DistroDetection.rst: formatting updated.

Signed-off-by: Konstantin Belov <konstantin.belov@gmail.com>
docs/ExternalTests.rst: markup updated, minor typos fixed, examples and descriptions refined.

Signed-off-by: Konstantin Belov <konstantin.belov@gmail.com>
docs/Keyval.rst: markup updated.

Signed-off-by: Konstantin Belov <konstantin.belov@gmail.com>
docs/DiagnosingFailures: outdated and missing investigation example replaced with new one, lists changed to listings, minor changes.

Signed-off-by: Konstantin Belov <konstantin.belov@gmail.com>
Merge pull request #886 from manul7/docs_update

Docs update