Merge pull request #108 from netboxlabs/docs/ENG-3595_python_plugin_install_docs

docs: clarifications and improvements to plugin docs

Author: rboucher-me

docs/netbox-enterprise/nbe-ec-custom-plugins.md

@@ -4,6 +4,10 @@ While NetBox Enterprise comes with a variety of certified and other community pl
 
 To do so, you will need to create a tarball containing the plugins you wish to install, known as a wheelhouse archive.
 
+!!! note
+    On each startup, the wheelhouse's contents will be applied to a fresh NetBox Python environment.
+    Also, you will need to create a new wheelhouse archive when the NetBox version provided in the NetBox Enterprise environment changes.
+
 ## Create a working directory
 
 First, create a temporary directory for your plugin downloads to go:
@@ -16,13 +20,18 @@ mkdir /tmp/wheelhouse
 
 Create a file called `requirements.txt` in your `/tmp/wheelhouse` directory, listing each of the plugins you'd like to include.
 
+For details on the format of requirements files, please see the [pip documentation](https://pip.pypa.io/en/stable/reference/requirements-file-format/).
+However, it is strongly recommended that you use `==` to include a specific known and tested version in your requirements file.
+
 ## Dowload the `constraints.txt` file for your release
 
 You can use `kubectl cp` to download a constraints file that contains a complete list of the pre-installed Python modules in your NetBox Enterprise version.
 
 To do so, download it with this command:
 
 ```{.bash}
+sudo ./netbox-enterprise shell
+
 NBE_SOURCE_POD="$( \
   kubectl get pods -A \
   -o go-template='{{ range .items }}{{ .metadata.name }}{{ "\n" }}{{ end }}' \
@@ -72,6 +81,8 @@ Both are configured to be able to accept wheelhouse uploads.
 To do so, run this:
 
 ```{.bash}
+sudo ./netbox-enterprise shell
+
 NBE_SOURCE_POD="$( \
   kubectl get pods -A \
   -o go-template='{{ range .items }}{{ .metadata.name }}{{ "\n" }}{{ end }}' \
@@ -84,9 +95,15 @@ kubectl cp -n kotsadm \
   "${NBE_SOURCE_POD}:/opt/netbox/netbox/media/wheelhouse.tar.gz"
 ```
 
+## Enable and Configure Your Plugins
+
+In the Admin Console configuration, make sure _Show Advanced Settings_ is checked.
+In the Python configuration overrides box, you can enter `PLUGINS = [...]` and `PLUGINS_CONFIG = {}` just as you would for any NetBox install.
+For details, see the [NetBox plugin documentation](https://netboxlabs.com/docs/netbox/en/stable/configuration/plugins/).
+
 ## Restart the NetBox containers
 
-The next time the NetBox pods restart, they should automatically apply your changes.
+The next time the NetBox pods restart, your changes should be automatically applied.
 
 If you are in restore mode, switching out of restore mode will enable installation of your plugins.
-If you are not, a "redeploy" in the admin console should do the same.
+If you are not, a "redeploy" in the admin console will trigger the same.