Add additional information to change password docs.

Add additional information / note for changing password if user is authenticating with a google account.

Feedback: Doesn't work if logged via google integration (after forgot password procedure no email arrives)

Page: https://docs.influxdata.com/influxdb/cloud/account-management/change-password/

Open the change-password page linked in the issue and review its existing guidance for users authenticating with a Google account. Add a note covering the reported forgot-password behavior, then verify that the published page clearly explains what those users should expect.

Written by the indexing model from the issue text.