Doc: Changes required for CloudSQL PostgreSQL Batch Source markdown doc in plugin UI

Description

I've updated the CDAP wiki doc based on comments from users. It would be great to incorporate the same changes into the markdown UI Doc for this plugin. See the wiki for the comments and changes:
https://cdap.atlassian.net/wiki/spaces/DOCS/pages/687997219/Google+CloudSQL+PostgreSQL+Batch+Source

Release Notes

None

Assignee

Unassigned

Reporter

Robin Rielley

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Components

Affects versions

Priority

Minor