Doc: Fix contrib/amcheck tip.

Peter Geoghegan <pg@bowt.ie>

Commit: 26640c40715c7f2045cf1b7c6753cac40b64d1e8
Author: Peter Geoghegan <pg@bowt.ie>
Date: 2020-04-12T04:07:20Z
Releases: 13.0
Doc: Fix contrib/amcheck tip.

Fixes an oversight in commit 20fbb711.

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doc/src/sgml/amcheck.sgml modified +1 −1

Documentation touched