Describe the problem

We don't document multi-tenancy features in the public docs: https://www.cockroachlabs.com/docs/stable/functions-and-operators.html#multi-tenancy-functions. Either remove the function crdb_internal.sql_liveness_is_alive added in #51087 or recategorize it. There's also a typo in the definition:

Checks is given sqlliveness session id is not expired -> Checks if given sqlliveness session id is not expired

Jira issue: CRDB-17846