Docs - Update pg_hba example for primary Geo node
What does this MR do?
The primary pg_hba.conf example provided does not have all the required entries for Geo to work correctly with an external PostgreSQL database.
This has been tested and is exactly how the Omnibus managed database sets it up, see /var/opt/gitlab/postgresql/data/pg_hba.conf on an Geo Primary with a bundled PostgreSQL database if you need to confirm this.
Related issues
Author's checklist
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Follow the Documentation Guidelines and Style Guide. -
If applicable, update the permissions table. -
Link docs to and from the higher-level index page, plus other related docs where helpful. -
Apply the documentation label.
Review checklist
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3. Maintainer
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