[BUG] Missing param in exception list fetch

[yctercero]

Documentation links

https://www.elastic.co/guide/en/security/current/exceptions-api-get-container.html

Description

We are missing specifying an optional parameter for fetching exception list containers. The following parameter - namespace_type is optional and will default to single. Anyone trying to fetch global exception lists, like the endpoint exception list, must specify agnostic.

Which documentation set(s) does this bug apply to?

ESS and serverless

Release version

Likely since first documented, so we would backport to earliest version supported.

Testing environment

Not needed (I don't think). Let me know if you do.