[DOC] Update documentation for the index setting index.remote_store.translog.buffer_interval

[ashking94]

What do you want to do?

• 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.
This is coming out from #4973

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

[hdhalter]

@Naarcha-AWS - is this a duplicate issue to #4973?

[ashking94]

@Naarcha-AWS - is this a duplicate issue to #4973?

The #4973 issue is for adding cluster level settings. I have created this issue for updating the documentation for the index level setting index.remote_store.translog.buffer_interval.