doc: update PG 11 release notes, mostly typo fixes

Bruce Momjian <bruce@momjian.us>

Commit: 2d502b81289f679a8244a0b6c94a4d294968bde1
Author: Bruce Momjian <bruce@momjian.us>
Date: 2018-06-23T21:15:34Z
Releases: 11.0
doc:  update PG 11 release notes, mostly typo fixes

Discussion: https://postgr.es/m/CAJnrtny0mYCMoRanZ1wvGqcPV-UDBoPetavDM1SqxnGVfZRV3g@mail.gmail.com

Author: Brad DeJong

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doc/src/sgml/release-11.sgml modified +22 −22

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