touch: shorten touch's docstring to make it fit into a one line
This make it show completely (untruncated) in `hg help -e evolve`.
This follows up on fed946edc293 where the docstring got unwrap for that
purpose and thus made the line length exceed 80 columns.
Pierre-Yves David <pierre-yves.david@octobus.net> [Wed, 06 Dec 2017 02:08:37 +0100] rev 3231
help: promote "amend" to important command
Recent change to what command we advertise as "basic". It turn out "amend" was
not part of one of them. Since "amend" is one of the core command of a rewriting
workflow, we promote it to "basic command".