go_spec: missing parentheses in "Handling panics" example

by **soggof**:

<pre>There is an error in go_spec.html, Handling panics section.
In the example, argument to defer should be a function call but parentheses are missing.
This is how it should be:

func protect(g func()) {
  defer func() {
      ...
  }()
  log.Println(&quot;start&quot;)
  g()
}

Thanks</pre>
