t5572: describe '--rebase' tests a little more
It can be hard at first glance to distinguish what is different between
the two tests 'recursive rebasing pull' and 'pull rebase recursing fails
with conflicts' in 't5572-pull-submodule.sh', and to understand how they
relate to the scenarios described in
a6d7eb2c7a (pull: optionally rebase
submodules (remote submodule changes only), 2017-06-23), which
implemented '--recurse-submodules' for 'git pull' and added these tests.
Rename the tests to be more descriptive and add some bullet points
comments describing the different scenarios.
Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>