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The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/12/wal-configuration.html
Description:

In the WAL configuration chapter, one finds this sentence:

On Linux and POSIX platforms checkpoint_flush_after allows to force the OS
that pages written by the checkpoint should be flushed to disk after a
configurable number of bytes. 

I think I have an idea what it says, but saw some discussion to this very
issue.  Can it be re-written?

Otherwise, an amazing, fantastic read, to this point.  Job very well done!