Add something about influxd recovery for op token

Add something about the [`influxd recovery`](https://docs.influxdata.com/influxdb/v2.1/reference/cli/influxd/recovery/) command? You can use that to create a new operator token also.

_Originally posted by @wbaker85 in https://github.com/influxdata/docs-v2/pull/3774#discussion_r806175668_

Start with the linked `influxd recovery` reference and the documentation section covering operator-token creation. Identify where recovery-based token creation fits, then document that path alongside the existing guidance and verify the command link and wording are accurate.

Written by the indexing model from the issue text.