Doc: explain dollar quoting in the intro part of the pl/pgsql chapter.

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

Commit: a64726e7a53482fca80860cd0ea5038f465f7fa1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-07-17T20:43:40Z
Releases: 9.3.18
Doc: explain dollar quoting in the intro part of the pl/pgsql chapter.

We're throwing people into the guts of the syntax with not much context;
let's back up one step and point out that this goes inside a literal in
a CREATE FUNCTION command.  Per suggestion from Kurt Kartaltepe.

Discussion: https://postgr.es/m/CACawnnyWAmH+au8nfZhLiFfWKjXy4d0kY+eZWfcxPRnjVfaa_Q@mail.gmail.com

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