docs(rds): add support for io2 and gp3 to storageType docs

[mazyu36]

Issue # (if applicable)

Closes #35656 .

Reason for this change

Missing storage types.

Description of changes

Add supported storage types to docs

Describe any new or updated permissions being added

N/A

Description of how you validated changes

N/A

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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