doc: add PG 10 doc item about VACUUM truncation, 7e26e02ee

Bruce Momjian <bruce@momjian.us>

Commit: 3d7741194a4688adea8404ab0a7bb57bac20232b
Author: Bruce Momjian <bruce@momjian.us>
Date: 2017-04-25T17:45:47Z
Releases: 10.0
doc:  add PG 10 doc item about VACUUM truncation, 7e26e02ee

Reported-by: Andres Freund

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doc/src/sgml/release-10.sgml modified +16 −0

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