Wrong description in "Installing API behind mod_wsgi in trove" page

[Hirotaka Wakabayashi]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [x] This doc is inaccurate in this way: ______
- [x] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

1. a2ensite command arg is wrong

```sudo a2ensite trove``` should be ```sudo a2ensite trove-api```

because I found the following error:
```
$ sudo a2ensite trove
ERROR: Site trove does not exist!
```

2. mod_wsgi package installation should exist

I think mod_wsgi is a very important package for trove-api. However I don't find mod_wsgi package installation through the docs. How do you think to replace the following description in this page:
```
Fedora 21/RHEL7/CentOS7:
  sudo yum install httpd

Fedora 22 (or higher):
  sudo dnf install httpd

Debian/Ubuntu:
  apt-get install apache2
```
with something like this description:
```
RHEL7/CentOS7:
  sudo yum install httpd mod_wsgi

RHEL8/CentOS8:
  sudo dnf install httpd python3-mod_wsgi

Fedora:
  sudo dnf install httpd mod_wsgi

Debian/Ubuntu:
  apt-get install apache2 libapache2-mod-wsgi-py3
```

Thanks in advance,
Hirotaka Wakabayashi

-----------------------------------
Release: on 2018-07-14 02:40:16
SHA: 513e0dd3cd27790718b31c6d0d4b556bd6de0793
Source: https://opendev.org/openstack/trove/src/doc/source/install/apache-mod-wsgi.rst
URL: https://docs.openstack.org/trove/latest/install/apache-mod-wsgi.html

[Lingxian Kong (kong)]

Hi Hirotaka, thanks for reporting this issue, Trove already uses storyboard for feature/bug tracking, could you please open an issue in https://storyboard.openstack.org/#!/project/openstack/trove?

[Hirotaka Wakabayashi (hiwkby)]

Hello Lingxian,

Thanks for your comment. I filed this issue in storyboard. Here is the link.
https://storyboard.openstack.org/#!/story/2007446

Could you please close the issue on launchpad?

Thanks in advance,
Hirotaka Wakabayashi