Documentation (#6506)

* added code and tooltips to custom site feedback

- clarifying that the feedback widget needs to be turned on
- showing how to disable the form and
- show the notes that are configured

* undoing a minor change that we unnecessary

- I changed a colon to a full stop at some point because I thought I
  would add another sentence, decided not to and then the unneeded
  change ended up in the previous commit.

* turned a comment I deleted into a tooltip

docs/setup/setting-up-site-analytics.md

@@ -274,18 +274,39 @@ generated by users interacting with the feedback widget with the help of some
 
     ``` js
     var feedback = document.forms.feedback
+    feedback.hidden = false // (1)!
+
     feedback.addEventListener("submit", function(ev) {
       ev.preventDefault()
 
-      /* Retrieve page and feedback value */
+      var page = document.location.pathname // (2)!
-      var page = document.location.pathname
       var data = ev.submitter.getAttribute("data-md-value")
 
-      /* Send feedback value */
+      console.log(page, data) // (3)!
-      console.log(page, data)
+
+      feedback.firstElementChild.disabled = true // (4)!
+
+      var note = feedback.querySelector(
+        ".md-feedback__note [data-md-value='" + data + "']"
+      )
+      if (note)
+        note.hidden = false // (5)!
     })
     ```
 
+    1.  The feedback widget is hidden by default so that it does not appear when
+        people have JavaScript turned off. So, it needs to be turned on here.
+
+    2.  Retrieve page and feedback value.
+
+    3.  Replace this with the code that sends the data off to your analytics
+        provider.
+
+    4.  Disable the form after submission.
+
+    5.  Show the configured notes. Which one is shown depends on the user
+        feedback.
+
 === ":octicons-file-code-16: `mkdocs.yml`"
 
     ``` yaml