Cover heap_page_prune_opt()'s cleanup lock tactic in README.

Noah Misch <noah@leadboat.com>

Commit: dfcd9cb30237f882b7308bdcbfb0318b22b1e224
Author: Noah Misch <noah@leadboat.com>
Date: 2016-01-02T02:52:22Z
Releases: 9.6.0
Cover heap_page_prune_opt()'s cleanup lock tactic in README.

Jeff Janes, reviewed by Jim Nasby.

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src/backend/storage/buffer/README modified +14 −12