Correct thinko in last-minute release note item.

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

Commit: ae8a602c32f839af8e467230fedb8e0c48540666
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-02-07T15:24:25Z
Releases: 9.6.3
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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