Added example of chrome.i18n.detectLanguage

chrome/common/extensions/docs/templates/intros/i18n.html

 <!--
 [NOTEs for editors:
  * Try to be consistent about string vs. message (it's probably not yet).
 -->
 
 <p>
 You need to put all of its user-visible strings into a file
 named <a href="i18n-messages"><code>messages.json</code></a>.
 Each time you add a new locale,
 you add a messages file
@@ skipping 541 matching lines @@
     var languages = languageList.join(",");
     document.getElementById("languageSpan").innerHTML = languages;
   })
 }
 </pre>
 
 <p>
 For details on calling <code>getAcceptLanguages()</code>, see the
 $(ref:i18n.getAcceptLanguages API reference).
 </p>
+
+<h3 id="example-detect-language">Example: detectLanguage</h3>
+<p>
+  The following code detects up to 3 languages from the given string and displays the result as strings separated by new lines. 

[mkearney1, 2015/09/04 19:56:59]

Trailing whitespace error coming up on this line when I take on patch.

+</p>
+
+<pre>
+function detectLanguage(inputText) {
+  chrome.i18n.detectLanguage(inputText, function(result) {
+    var outputLang = "Detected Language: ";
+    var outputPercent = "Language Percentage: "; 

[mkearney1, 2015/09/04 19:56:59]

Trailing whitespace error coming up on this line when I take on the patch.

+    for(i = 0; i < result.languages.length; i++) {
+      outputLang += result.languages[i].language + " ";
+      outputPercent +=result.languages[i].percentage + " ";
+    }
+    document.getElementById("languageSpan").innerHTML = outputLang + "\n" + outputPercent + "\nReliable: " + result.isReliable;
+  });
+}
+</pre>
+
+<p>
+  For more details on calling <code>detectLanguage(inputText)</code>, see the $(ref:i18n.detectLanguage API reference).
+</p>