Keystone Install Guide is providing wrong dependency on apt install keystone

[Natthasak Vechprasit]

https://docs.openstack.org/keystone/stein/install/keystone-install-ubuntu.html

ERROR => apt install keystone apache2 libapache2-mod-wsgi

Console Output:
apt install keystone apache2 libapache2-mod-wsgi
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 keystone : Depends: libapache2-mod-wsgi-py3 but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

SUCCESSFUL COMMAND => apt install keystone apache2 libapache2-mod-wsgi-py3

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-----------------------------------
Release: on 2018-12-10 15:55:13
SHA: 1828d0612cf2c51427773077dc25bd8b659eb549
Source: https://opendev.org/openstack/keystone/src/doc/source/install/keystone-install-ubuntu.rst
URL: https://docs.openstack.org/keystone/stein/install/keystone-install-ubuntu.html