Document how to autoscroll ScrollContainer.

It is not uncommon to want to scroll to the most recently added child of
a ScrollContainer (e.g. a chat box or activity log). This is a little
tricky, since `ensure_control_visible` will not work on a node on the
same frame as you add it. Let's at least document that you need to wait
until the next frame.

Relates to https://github.com/godotengine/godot-proposals/issues/3629.

Co-authored-by: Yuri Sizov <pycbouh@users.noreply.github.com>

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