Tidy up add-site.md, mostly docs style guide stuff, and a rewording of the final admonition.

Add plural `distributions` to Glossary.

Author: stevepiercy

docs/glossary.md

@@ -802,6 +802,7 @@ reference implementation
     The reference implementation often accompanies a technical standard, and demonstrates what should be considered the "correct" behavior of any other implementation of it.
 
 distribution
+distributions
     A Plone distribution is a pre-packaged version of Plone that includes specific features, themes, modules, and configurations.
     It is a convenient way to get a specific type of website up and running quickly, as the distribution includes everything needed to run that type of site.
 

docs/install/add-site.md

@@ -3,11 +3,11 @@ myst:
   html_meta:
     "description": "How to add a Plone site to an existing Zope instance"
     "property=og:description": "How to add a Plone site to an existing Zope instance"
-    "property=og:title": "Create a Plone site"
+    "property=og:title": "Add a Plone site"
     "keywords": "Plone 6, create, add, factory, distributions"
 ---
 
-% This should move into the Admin guide once https://github.com/plone/documentation/pull/1746 is merged.
+% TODO: This should move into the Admin guide once https://github.com/plone/documentation/pull/1746 is merged.
 
 (add-a-plone-site-label)=
 
@@ -17,19 +17,19 @@ This section explains how to add a Plone site to an existing Zope instance.
 It assumes that you have already {doc}`installed </install/index>` and started Plone.
 
 Some installation methods create a Plone site for you already.
-Follow these instructions if you used an installation method that did not do this,
-or if you need a second Plone site in the same instance for some reason.
+Follow these instructions if you used an installation method that did not do this, or if you need a second Plone site in the same instance for some reason.
 
 ```{versionadded} Plone 6.1
 The user interface for creating a new Plone site was changed in Plone 6.1.
 You can access it the same way in Plone 6.0, but the appearance and options are different.
 ```
 
-Open the Plone backend. Usually it is running at http://localhost:8080/
+Visit the Plone backend in a web browser.
+Usually it is running at http://localhost:8080/
 
-This launch screen prompts you to choose one of the available {term}`distributions <distribution>` to create a new site.
+The launch screen prompts you to choose one of the available {term}`distributions` to create a new site.
 
-% add a link to choose-user-interface doc once https://github.com/plone/documentation/pull/1749 is merged
+% TODO: Add a link to the choose-user-interface doc once https://github.com/plone/documentation/pull/1749 is merged.
 
 ````{card}
 ```{image} /backend/upgrading/version-specific-migration/images/distribution-chooser.png
@@ -42,14 +42,16 @@ _Launch screen for choosing a distribution_
 
 Hover over your choice and click the {guilabel}`Create` button.
 
-Now complete the form with initial configuration for your site. You can configure:
+Now complete the form with initial configuration for your site.
+You can configure the following settings.
 
-:::{card}
 Path Identifier
-:   The ID of the site. This ends up as part of the URL unless hidden by an upstream web server.
+:   The ID of the site.
+    This ends up as part of the URL unless hidden by an upstream web server.
 
 Title
-:   The name of the site in the HTML `title` element. This will be shown as part of the title of the browser tab on each page.
+:   The name of the site in the HTML `title` element.
+    This will be shown as part of the title of the browser tab on each page.
 
 Site Description
 :   A brief description that will be served in an HTML `meta` tag.
@@ -62,14 +64,13 @@ Language
 
 Timezone
 :   The default timezone setting of the portal.
-:::
 
-Finally, press {guilabel}`Submit`.
+Finally, click the {guilabel}`Submit` button.
 
 Have fun with your new Plone site!
 
 ```{important}
-If you are using the Volto frontend, keep in mind that the launch screen for adding a site is hosted by the Plone backend server.
-After you create the site, you must switch to Volto.
-Usually, it is running at http://localhost:3000.
+The launch screen for adding a site is hosted by the Plone backend server.
+Regardless of the frontend you select, you will be redirected to the backend's user interface after you create the site.
+If you select the Volto frontend, you can switch to it by changing the port number in the URL, usually `3000`, and visiting it at http://localhost:3000, for example.
 ```