b09a64d602
I noticed that all non-composite, non-array entries in pg_type.dat had descr strings, except for "json" and the pseudo-types. The lack for json seems certainly an oversight, and there's surely little reason to not have entries for the pseudo-types either. So add some. "make reformat-dat-files" turned up some formatting issues in pg_amop.dat, too, so fix those in passing. No catversion bump since the backend doesn't care too much what is in pg_description.
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