Remove the outdated note information

Now, kolla-ansible support non-root to deploy[0], the note is
outdated and inaccuracy, remove it is necessary

[0]: https://github.com/openstack/kolla-ansible/blob/master/ansible/group_vars/all.yml#L18

Change-Id: I4fc005949afd64389bc2be68161426c6a2590ca4

doc/source/user/quickstart.rst

@@ -22,10 +22,6 @@ The host machine must satisfy the following minimum requirements:
 - 8GB main memory
 - 40GB disk space
 
-.. note::
-
-   Root access to the deployment host machine is required.
-
 Install dependencies
 ~~~~~~~~~~~~~~~~~~~~