Change user password: add instructions to recover an operator token

Add information about [recovering an operator token](https://docs.influxdata.com/influxdb/v2.3/reference/cli/influxd/recovery/auth/create-operator/#generate-a-new-operator-token) that the admin can then use to change a password.

APP [4:50 AM](https://influxdata.slack.com/archives/C03HRU09PHA/p1659001801422499)
Page: https://docs.influxdata.com/influxdb/v2.3/users/change-password/
Feedback: I don't have token.

##### Relevant URLs
- https://docs.influxdata.com/influxdb/v2.3/users/change-password/
- https://docs.influxdata.com/influxdb/v2.3/reference/cli/influxd/recovery/auth/create-operator/#generate-a-new-operator-token

Open the change-password page and the linked operator-token recovery instructions first. Add guidance explaining how an admin can recover an operator token and use it to change a password, then verify that the page addresses the reported “I don't have token” feedback and that both links work.

Written by the indexing model from the issue text.