Correct thinko in last-minute release note item.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 13b30ada998988f14031f57f61396605ae4e9c33
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-02-07T15:24:25Z
Releases: 9.5.7
Correct thinko in last-minute release note item.

The CREATE INDEX CONCURRENTLY bug can only be triggered by row updates,
not inserts, since the problem would arise from an update incorrectly
being made HOT.  Noted by Alvaro.

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