Docs on "task switching" could use clarification

[JeffFessler]

The last two paragraphs of the signals documentation page says:

Warning: it is essential to avoid task switching inside Gtk callbacks, as this corrupts the Gtk C-stack.
For example, use @async print or queue a message for yourself.
...
These restrictions should be fixed once JuliaLang/julia#13099 is merged.

First, the phrase "For example, use @async print or queue a message for yourself." is unclear to me. Does it mean this is an example of task switching that should be avoided, or is it an instruction for how to avoid task switching?

Second, it looks like JuliaLang/julia#13099 is merged, so should these two paragraphs be deleted? Or is some warning still needed?

I am studying this documentation because I have a Gtk callback with a read call (from an audio stream) in it that is not working (it just hangs, does not crash), so I am wondering if I am "task switching" unknowingly.

I would submit a PR to refine the documentation if I understood the situation...