[Bug 235850] bectl(8): create should mention it creates from booted system without any other argument

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235850

Kyle Evans <kevans at freebsd.org> changed:

           What    |Removed                     |Added
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                 CC|                            |kevans at freebsd.org

--- Comment #3 from Kyle Evans <kevans at freebsd.org> ---
(In reply to Mateusz Piotrowski from comment #1)

Right, he's talking specifically about the 'create' subcommand. I note that the
man page here is kind of... bad. We should do the following:

1.) Get rid of the bectl create [-r] beName at snapshot line in SYNOPSIS
2.) Get rid of the same down in commands
3.) Amend the create command description to mention:

If the
.Fl e
argument is specified, the new environment will be cloned from the given
nonActiveBE | beName at snapshot.
When the
.Fl e
argument is not specified, the new environment will be created from the
currently booted environment. 
If
.Nm
is creating from another boot environment, a snapshot of that boot environment
will be created to clone from.

Of course, the markup is basically all wrong, but I think that gets the idea
across. We should mention for those not familiar with bectl that the default is
to use the currently booted environment, and we should mention for those maybe
not necessarily familiar with some of the underlying ZFS terminology that
create of anything other than beName at snapshot implies that a snapshot of that
boot environment will be made for creation.

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