Alvaro Herrera e6785a5ca1 Fix wording in amvalidate error messages
Remove some gratuituous message differences by making the AM name
previously embedded in each message be a %s instead.  While at it, get
rid of terminology that's unclear and unnecessary in one message.

Discussion: https://postgr.es/m/20170523001557.bq2hbq7hxyvyw62q@alvherre.pgsql
2017-05-30 15:45:42 -04:00
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