[DOC] Update event analysis to Logs in Observability plugin

[xluo-aws]

What do you want to do?

• [X] Request a change to existing documentation
• [ ] Add new documentation
• [ ] Report a technical problem with the documentation
• [ ] Other

Tell us about your request. Provide a summary of the request and all versions that are affected. https://opensearch.org/docs/latest/observing-your-data/event-analytics/ need to be updated because event analytics seems to be renamed to logs, please double check with Observability team.

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.

[Naarcha-AWS]

@xluo-aws: Which version of OpenSearch are you referring to?

[xluo-aws]

I found it on 2.8, but not sure when it happened, better check with observability team.

[hdhalter]

@vagimeli , @nitincd - can you please confirm?