Fix "sesssion" typo

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: aea76d128ad85f38aa0f4255fb9d46d95b835755
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2015-09-28T22:13:42Z
Releases: 9.5.0
Fix "sesssion" typo

It was introduced alongside replication origins, by commit
5aa2350426c, so backpatch to 9.5.

Pointed out by Fujii Masao

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