Tom Lane d3aa114ac4 Doc: improve discussion of race conditions involved in LISTEN.
The user docs didn't really explain how to use LISTEN safely,
so clarify that.  Also clean up some fuzzy-headed explanations
in comments.  No code changes.

Discussion: https://postgr.es/m/3ac7f397-4d5f-be8e-f354-440020675694@gmail.com
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