Remove explanation for init.

since the code does not have it.

Author: volezheng

Diff for: _content/doc/tutorial/random-greeting.html

@@ -91,13 +91,6 @@
         >
         to generate a random number for selecting an item from the slice.
       </li>
-      <li>
-        Add an <code>init</code> function to seed the <code>rand</code> package
-        with the current time. Go executes <code>init</code> functions
-        automatically at program startup, after global variables have been
-        initialized. For more about <code>init</code> functions, see
-        <a href="/doc/effective_go.html#init">Effective Go</a>.
-      </li>
       <li>
         In <code>Hello</code>, call the <code>randomFormat</code> function to
         get a format for the message you'll return, then use the format and