Bump documented required postgres version

Due to this commit: https://github.com/discourse/discourse/commit/a5ee45ccbec1a8933f721c10fb14956d292c1ae7 Discourse now requires at least postgres 9.2. However the documentation currently states it only requires postgresql 9.1. That should be updated, or that commit adjusted to avoid requiring the new json type.

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Ok, I changed all instances of Postgres 9.1 – thanks for the reminder.