doc: fix spelling "connction" to "connection"

Bruce Momjian <bruce@momjian.us>

Commit: 19fd4f20b6a75058ca5be8037da529bb8cd55898
Author: Bruce Momjian <bruce@momjian.us>
Date: 2020-11-11T00:18:35Z
Releases: 13.2
doc: fix spelling "connction" to "connection"

Was wrong in commit 1a9388bd0f.

Reported-by: Tom Lane, Justin Pryzby

Discussion: https://postgr.es/m/20201102063333.GE22691@telsasoft.com

Backpatch-through: 9.5

Files

Documentation touched