doc: Updated usage for push | pull.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
Removed comment out of header, and added "coming soon."
doc: Corrected typo.
doc: Corrected typo.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Deleted redundant "so that" phrase.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>