Explain what `view` does

We have an explanation for `explain` (by way of examples) but nothing to
say what view does.

qa/qa/page/README.md

@@ -86,6 +86,9 @@ module Page
 end
 ```
 
+The `view` DSL method declares the filename of the view where an
+`element` is implmented.
+
 It is possible to use `element` DSL method without value, with a String value
 or with a Regexp.