message: docs: removing errant double-quote
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diff: @@ -357,7 +357,7 @@ big chunks of HTML with many data bindings.
  Try it out. Because the array has four items, the message should appear.
  -Go back into <code>app.component.ts"</code> and delete or comment out one of the elements from the hero array.
  +Go back into <code>app.component.ts</code> and delete or comment out one of the elements from the hero array.
  The browser should refresh automatically and the message should disappear.
  