git-p4: improve consistency of docstring formatting

git-p4: improve consistency of docstring formatting

This patch attempts to improve the consistency of the docstrings by
making the following changes:

  - Rewraps all docstrings to a 79-character column limit.
  - Adds a full stop at the end of every docstring.
  - Removes any spaces after the opening triple-quotes of all
    docstrings.
  - Sets the hanging indent of multi-line docstrings to 3-spaces.
  - Ensures that the closing triple-quotes of multi-line docstrings are
    always on a new line indented by a 3-space indent.

Signed-off-by: Joel Holdsworth <jholdsworth@nvidia.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>