EXPLAIN ANALYZE limitations in docs should be called ANALYZE limitations

[msirek]

The limitations listed in docs at https://www.cockroachlabs.com/docs/stable/known-limitations#limitations-for-explain-analyze are actually limitations of the ANALYZE statement or CREATE STATISTICS statement, which collects table statistics, not EXPLAIN ANALYZE, which runs the query and displays an "EXPLAIN" of the execution.

Jira issue: CRDB-30783