[tutorials] Address some of the small refinements for word-viewer (#829)

Author: AndrewJakubowicz

packages/lit-dev-content/samples/tutorials/word-viewer/06/after/index.html

@@ -1,3 +1,3 @@
 <script type="module" src="word-viewer.js"></script>
 
-<word-viewer words="👋.from.html"></word-viewer>
+<word-viewer words="1.2.3.4"></word-viewer>

packages/lit-dev-content/samples/tutorials/word-viewer/06/before/index.html

@@ -1,3 +1,3 @@
 <script type="module" src="word-viewer.js"></script>
 
-<word-viewer words="👋.from.html"></word-viewer>
+<word-viewer words="1.2.3.4"></word-viewer>

packages/lit-dev-content/site/tutorials/content/word-viewer/00.md

@@ -1,5 +1,6 @@
-In this tutorial you will invent your own HTML element: `<word-viewer>`.
-You can see it on the right!
+In this tutorial you will invent your own HTML element: `<word-viewer>`. It's in
+the proud tradition of other useful elements like `<marquee>` and `<blink>`! You
+can see it on the right!
 
 The `word-viewer` component takes a list of words separated by periods, and
 shows them one at a time. You use it in HTML like this:

packages/lit-dev-content/site/tutorials/content/word-viewer/02.md

@@ -40,7 +40,8 @@ attribute changes.
 
 You should now see `initial value` in the preview.
 
-Before moving on, set `words` from an attribute.
+Before moving on, change to the `index.html` file and set `words` from an
+attribute.
 
 ```html
 <!-- index.html -->