Update documentation for "file_system_provider" manifest section.

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

Index: chrome/common/extensions/docs/templates/intros/fileSystemProvider.html
diff --git a/chrome/common/extensions/docs/templates/intros/fileSystemProvider.html b/chrome/common/extensions/docs/templates/intros/fileSystemProvider.html
index 7ca0ab38c80a3907636ac3abf58904e6b9a74e6c..9c406b268f35918e02369b24ff94e14ad5f07d1b 100644
--- a/chrome/common/extensions/docs/templates/intros/fileSystemProvider.html
+++ b/chrome/common/extensions/docs/templates/intros/fileSystemProvider.html
@@ -1,5 +1,5 @@
 <h2 id="manifest">Manifest</h2>
-<p>You must declare the "fileSystemProvider" permission
+<p>You must declare the "fileSystemProvider" permission and section
 in the <a href="manifest">extension manifest</a>
 to use the File System Provider API.
 For example:</p>
@@ -7,13 +7,25 @@ For example:</p>
 {
   "name": "My extension",
   ...
-  <b>"permissions": [
+  "permissions": [
     "fileSystemProvider"
-  ]</b>,
+  ],
+  ...
+  "file_system_provider": [
+    "configurable": true,
+    "multiple_mounts": true,
+    "source": "network"
+  ],
   ...
 }
 </pre>
 
+<p class="api_reference">
+The <code>file_system_provider</code> section must be declared as follows:
+{{+partials.manifest_type
+   type:apis.extensions.manifestTypes.byName.FileSystemProviderCapabilities /}}
+</p>
+
 <h2 id="overview">Overview</h2>
 <p>
 File System Provider API allows extensions to support virtual file systems,