docs: replace 'master' with 'primary' where appropriate.

Andres Freund <andres@anarazel.de>

Commit: 9e101cf60612f4be4f855d7393531900c2986a55
Author: Andres Freund <andres@anarazel.de>
Date: 2020-07-08T20:03:32Z
Releases: 14.0
docs: replace 'master' with 'primary' where appropriate.

Also changed "in the primary" to "on the primary", and added a few
"the" before "primary".

Author: Andres Freund
Reviewed-By: David Steele
Discussion: https://postgr.es/m/20200615182235.x7lch5n6kcjq4aue@alap3.anarazel.de

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