Update MongoDB documentation about regex in native queries

Description

We have to update the documentation and add a testcase as soon as
https://jira.mongodb.org/browse/JAVA-2224

has been solved

Environment

None

Assignee

Aleksandr Mylnikov

Reporter

Davide D'Alto

Labels

None

Feedback Requested

None

Feedback Requested By

None

backPortable

None

Suitable for new contributors

Yes, likely

Pull Request

None

backportDecision

None

backportReEvaluate

None

Components

Fix versions

Priority

Major
Configure