pgsql: Correct misleading error messages

Correct misleading error messages

Commit 7d6d2c4bbd7 dropped opcintype from the index AM strategy
translation API.  But some error messages about failed lookups still
mentioned it, even though it was not used for the lookup.  Fix by
removing ipcintype from the error messages as well.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/95e12d4d9b228855af8a2a34ca28c33924d4edd1

Modified Files
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src/backend/commands/indexcmds.c | 4 ++--
src/backend/commands/tablecmds.c | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)