autoplaying videos is just content (#129)

Unwanted, even.

The point here is better made if the statement is short, but this
sentence is clearer without the added load.

index.html

@@ -348,7 +348,7 @@ <h3 id="render" data-export="" data-dfn-type="dfn">
 People must be able to change web pages according to their needs.
 For example, people should be able to install style sheets,
 assistive browser extensions,
-and blockers of unwanted content or scripts or auto-played videos.
+and blockers of unwanted content or scripts.
 We will build features and write specifications
 that respect peoples' agency,
 and will create user agents to represent those preferences on the web user's behalf.