Fix default showCopy value and title

Author: dfreeman

addon/components/docs-snippet/component.js

@@ -9,7 +9,7 @@ export default Component.extend({
 
   language: undefined,
   title: undefined,
-  showCopy: false,
+  showCopy: true,
 
   _unindent: function(src) {
     if (!this.get('unindent')) {

addon/components/docs-snippet/template.hbs

@@ -1,5 +1,5 @@
-{{#if file}}
-  <div class='docs-snippet__title'>{{file}}</div>
+{{#if title}}
+  <div class='docs-snippet__title'>{{title}}</div>
 {{/if}}
 
 <div class='docs-snippet' data-test-id={{name}}>

tests/dummy/app/pods/docs/components/docs-snippet/template.hbs

@@ -51,3 +51,7 @@
 <p>Be sure to include the file extension.</p>
 
 <p>Code snippets are provided by the `ember-code-snippet` addon and are made available to your app via the `dummy/snippets` importable ES6 module. If you ever want to debug which snippets are getting registered, you can open this module in your devtools (+O, dummy/snippet).</p>
+
+<h2>Customizing Snippets</h2>
+
+<p></p>