The C-c C-a binding in the change description is for Ack

and not for toggling amend.
Merge pull request #1308 from dachary/wip-c-c-c-a

The C-c C-a binding in the change description is for Ack
proofread the submodule section

Signed-off-by: Loic Dachary <loic@dachary.org>
magit-commit-add-log: bugfix

As suggested by Daniel Dehennin in #1309.
Merge pull request #1310 from dachary/wip-submodules

proofread the submodule section