Note case where nbtree VACUUM finishes splits.

Peter Geoghegan <pg@bowt.ie>

Commit: 35bc0ec7c800b303e0629913ac336924cf979dcc
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2019-03-05T01:57:36Z
Releases: 12.0
Note case where nbtree VACUUM finishes splits.

The nbtree README claims that VACUUM can never finish interrupted page
splits by design.  That isn't entirely accurate, though.  Note an
exception to the general rule.

Discussion: https://postgr.es/m/CAH2-Wz=_Xvv8byzK_LvY4ci76OgsHCQzoKF7We8yG9waO7j6rA@mail.gmail.com

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