[Docs] Fix usage of @internal and @hidden tags - Epic

[deyaaeldeen]

We should follow these guidelines after recent work done by the docs team to support the @internal tag:

• use the @internal tag only for definitions that are not exported by src/index.ts and you do not want to generate documentation for them on docs.microsoft.com

• use the @hidden tag only for definitions that are exported by src\index.ts but you still do not want to generate documentation for them on docs.microsoft.com

• do not use both @internal and @hidden for one definition

• [x] textanalytics

• [ ] formrecognizer

• [x] metricadvisor

• [ ] cosmos

• [ ] servicebus

• [ ] storage

• [x] appconfiguration

• [x] search

• [x] tables

• [x] communication

• [x] core

• [x] schemaregistry

• [ ] anomalydetector

• [x] digitaltwins

• [x] eventgrid

• [ ] eventhubs

• [ ] identity

• [ ] keyvault

• [x] monitor

[ghost]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @southpolesteve, @zfoster

[topshot99]

closing this up as PR is merged.