initial branch: give hints after switching the default name

It is likely that those who came to Git after 3.0 switched the
default initial branch name to 'main' would still try to follow
tutorials that were written before 3.0 happened and with the
assumption that the tool would call the initial branch 'master'.

To help these new users after 3.0 boundary, let's retain one part of
the hint we will be giving before the default changes, namely, how
to rename the branch an unconfigured Git has created just once.

We do this without telling them how to permanently configure the
default name of the initial branch, and that design choice is very
much deliberate.  The whole point of switching the default name was
because we did not want to force individual users to configure their
default branch name but while the hard wired default was 'master',
they _had_ to configure it away from 'master' in order to conform to
the recent norm, and a hint that tells them how to do so is useful.

But once the default is renamed to 'main', that no longer is true.
A narrower audience who are new users that follow an instruction
that assumes the initial branch name is 'master' would only need to
learn "here is how to change the branch name to match the tutorial
you are following in the repository you created for practice", and
"here is how you keep creating repositories with the first branch
with a name everybody hates" is unnecessary.

It also needs to be noted that the advise token to squelch the
message is the same advice.defaultBranchName as before, which is
also very much deliberate.  The users who do have that configured
are those who _have_ been using Git since before 3.0, and they are
not the target audience for the new advice message.  Reusing the
same advise token ensures that they do not have to turn the message
off.

Helped-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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