Adjust hints and docs to suggest CREATE EXTENSION not CREATE LANGUAGE.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 2e83e6bd74ee8d4d119edf8272406f23e6c546cf
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2018-04-27T17:42:03Z
Releases: 11.0
Adjust hints and docs to suggest CREATE EXTENSION not CREATE LANGUAGE.

The core PLs have been extension-ified for seven years now, and we can
reasonably hope that all out-of-core PLs have been too.  So adjust a few
places that were still recommending CREATE LANGUAGE as the user-level
way to install a PL.

Discussion: https://postgr.es/m/CA+TgmoaJTUDMSuSCg4k08Dv8vhbrJq9nP3ZfPbmysVz_616qxw@mail.gmail.com

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