doc: Fix description of target_session_attrs=prefer-standby

Michael Paquier <michael@paquier.xyz>

Commit: 2977f244bc7e64e046364122be3fef08aa6efef9
Author: Michael Paquier <michael@paquier.xyz>
Date: 2021-04-29T02:44:24Z
Releases: 14.0
doc: Fix description of target_session_attrs=prefer-standby

If no standbys can be found in the set of connection points provided,
the fallback behavior is "any", and not "all" that does not exist.

Author: Greg Nancarrow
Reviewed-by: Laurenz Albe
Discussion: https://postgr.es/m/CAJcOf-fDaCv8qCpWH7k5Yh6zFxZeUwZowu4sCWQ2zFx4CdkHpA@mail.gmail.com

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