Note for instance name at wrong position

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:
Note message for section "instance name" is now located after section "Availability Zone" which makes users feel confused:

In current horizon user document:

================================================================================
   Instance Name
      Assign a name to the virtual machine.

   Availability Zone
      By default, this value is set to the availability zone given by the
      cloud provider (for example, ``us-west`` or ``apac-south``). For some
      cases, it could be ``nova``.

      .. note::

         The name you assign here becomes the initial host name of the server.
         If the name is longer than 63 characters, the Compute service
         truncates it automatically to ensure dnsmasq works correctly.

         After the server is built, if you change the server name in the API
         or change the host name directly, the names are not updated in the
         dashboard.

         Server names are not guaranteed to be unique when created so you
         could have two instances with the same host name.
===============================================================================

The above contents should be like follows:

================================================================================
   Instance Name
      Assign a name to the virtual machine.

      .. note::

         The name you assign here becomes the initial host name of the server.
         If the name is longer than 63 characters, the Compute service
         truncates it automatically to ensure dnsmasq works correctly.

         After the server is built, if you change the server name in the API
         or change the host name directly, the names are not updated in the
         dashboard.

         Server names are not guaranteed to be unique when created so you
         could have two instances with the same host name.

   Availability Zone
      By default, this value is set to the availability zone given by the
      cloud provider (for example, ``us-west`` or ``apac-south``). For some
      cases, it could be ``nova``.

===============================================================================

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

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-----------------------------------
Release: 13.0.0.0b3.dev125 on 2018-01-09 04:20
SHA: 091121b10ff2090ec4bce7c4f5436c9ade3a790d
Source: https://git.openstack.org/cgit/openstack/horizon/tree/doc/source/user/launch-instances.rst
URL: https://docs.openstack.org/horizon/latest/user/launch-instances.html