Update obsolete sentence in README.parallel.

Robert Haas <rhaas@postgresql.org>

Commit: 28e04155f17cabda7a18aee31d130aa10e25ee86
Author: Robert Haas <rhaas@postgresql.org>
Date: 2018-01-23T16:22:47Z
Releases: 11.0
Update obsolete sentence in README.parallel.

Since 9.6, heavyweight locking is not an abstract and unhandled
concern of the parallel machinery, but rather something to which
we have a specific approach.

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src/backend/access/transam/README.parallel modified +3 −3