[docs] Docs need a note about where cudet finds credentials if not default

[Michael Petersen]

https://docs.mirantis.com/openstack/fuel/fuel-9.1/release-notes/update-product.html

If a user has changed the default user/password for Fuel then this appears to return an error:

Unauthorized: The request you have made requires authentication. (HTTP 401) (Request-ID: req-c4dce035-8f84-4012-8459-d3873beead61)

It would be nice if there was a note mentioning where to update the credentials, or that it's at least required if they are not the default, next to step 5.

[Fuel Devops McRobotson (fuel-devops-robot)]

Fix proposed to branch: stable/9.1
Change author: Olena Logvinova <email address hidden>
Review: https://review.fuel-infra.org/28106

[Fuel Devops McRobotson (fuel-devops-robot)]

Reviewed: https://review.fuel-infra.org/28106
Submitter: Mariia Zlatkova <email address hidden>
Branch: stable/9.1

Commit: f6221302e7e4982696e252d0a82f9c17e5c543e2
Author: Olena Logvinova <email address hidden>
Date: Wed Nov 2 13:10:28 2016

Add a note where to update credentials for Cudet check

This patch adds a note that instructs the user where to change
the Fuel credentials to non-default ones before running Cudet.

Change-Id: I7c719a9e680d602134264ddc98b6303888adca9a
Closes-Bug: #1636543

[Olena Logvinova (ologvinova)]

The update is now published. See the note in step 5 of the Update procedure [1].

[1] https://docs.mirantis.com/openstack/fuel/fuel-9.1/release-notes/update-product.html