Add missing documentation for web.routing in umbracoSettings.config (#7468)

Cheers Kenn :)

src/Umbraco.Web.UI/config/umbracoSettings.config

@@ -231,6 +231,14 @@
         By default you can call any content Id in the url and show the content with that id, for example:
         http://mysite.com/1092 or http://mysite.com/1092.aspx would render the content with id 1092. Setting
         this setting to true stops that behavior
+      @disableRedirectUrlTracking
+        When the URL changes for content, redirects are automatically created for redirect handling within the
+        request pipeline. Setting this setting to true stops the automatic creation of redirects. Note that this
+        does not stop the request pipeline from handling any previously created redirects.
+      @urlProviderMode
+        By default Umbraco automatically figures out if internal URLs should be rendered as relative or absolute,
+        depending on the current request and the configured domains. By setting this setting to "Relative" or
+        "Absolute" you can force Umbraco to always render URLs as either relative or absolute.
       @umbracoApplicationUrl
         The url of the Umbraco application. By default, Umbraco will figure it out from the first request.
         Configure it here if you need anything specific. Needs to be a complete url with scheme and umbraco