Update documentation for "file_system_provider" manifest section.

chrome/common/extensions/api/file_system_provider.idl

Index: chrome/common/extensions/api/file_system_provider.idl
diff --git a/chrome/common/extensions/api/file_system_provider.idl b/chrome/common/extensions/api/file_system_provider.idl
index dea956abb9f8cfd20b29c3a824246acb9878a87e..8860aa8b3dc758360995534a707f8dd02d5c2b82 100644
--- a/chrome/common/extensions/api/file_system_provider.idl
+++ b/chrome/common/extensions/api/file_system_provider.idl
@@ -413,7 +413,7 @@ namespace fileSystemProvider {
   };
 
   // Options for the <code>onConfigureRequested()</code> event.
-  [nodoc] dictionary ConfigureRequestedOptions {
+  dictionary ConfigureRequestedOptions {
     // The identifier of the file system to be configured.
     DOMString fileSystemId;
 
@@ -488,7 +488,7 @@ namespace fileSystemProvider {
     static void get(DOMString fileSystemId, GetCallback callback);
 
     // Notifies about changes in the watched directory at <code>
-    // observedPath</code> in <code>recursive</code mode. If the file system is
+    // observedPath</code> in <code>recursive</code> mode. If the file system is
     // mounted with <code>supportsNofityTag</code>, then <code>tag</code> must
     // be provided, and all changes since the last notification always reported,
     // even if the system was shutdown. The last tag can be obtained with <code>
@@ -637,8 +637,10 @@ namespace fileSystemProvider {
         ProviderErrorCallback errorCallback);
 
     // Raised when showing a configuration dialog for <code>fileSystemId</code>
-    // is requested. If it's not supported, then this event must not be handled.
-    [maxListeners=1, nodoc] static void onConfigureRequested(
+    // is requested. If it's handled, the <code>
+    // file_system_provider.configurable</code> manfiest option must be set to
+    // true.
+    [maxListeners=1] static void onConfigureRequested(
         ConfigureRequestedOptions options,
         ProviderSuccessCallback successCallback,
         ProviderErrorCallback errorCallback);
@@ -646,8 +648,10 @@ namespace fileSystemProvider {
     // Raised when showing a dialog for mounting a new file system is requested.
     // If the extension/app is a file handler, then this event shouldn't be
     // handled. Instead <code>onLaunched</code> should be handled in order to
-    // mount new file systems when a file is opened.
-    [maxListeners=1, nodoc] static void onMountRequested(
+    // mount new file systems when a file is opened. For multiple mounts, the
+    // <code>file_system_provider.multiple_mounts</code> manifest option must
+    // be set to true.
+    [maxListeners=1] static void onMountRequested(
         ProviderSuccessCallback successCallback,
         ProviderErrorCallback errorCallback);