Updated RDS doc for oracle dashboards (#4764)

* Updated RDS doc for oracle dashboard

* Update rds.md

* Update docs/integrations/amazon-aws/rds.md

* Updated doc for oracle

* Resolved conflicts

* minor title fixes

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Co-authored-by: Jagadisha V <[email protected]>
Co-authored-by: John Pipkin (Sumo Logic) <[email protected]>

Author: 3 people