Clean up formatting to simplify post-Doxygen processing.

ppapi/cpp/message_loop.h

Index: ppapi/cpp/message_loop.h
diff --git a/ppapi/cpp/message_loop.h b/ppapi/cpp/message_loop.h
index 9e28b2d835b18b3d92786e78c7750b4545934446..c1e217bbe36663697ec96e75fa79b71553a9760f 100644
--- a/ppapi/cpp/message_loop.h
+++ b/ppapi/cpp/message_loop.h
@@ -7,6 +7,9 @@
 
 #include "ppapi/cpp/resource.h"
 
+/// @file
+/// This file defines the PPB_MessageLoop API.
+
 namespace pp {
 
 class CompletionCallback;
@@ -39,13 +42,15 @@ class InstanceHandle;
 ///    - Call Run() with the message loop resource.
 ///
 ///   Your callbacks should look like this:
-///      void DoMyWork(void* user_data, int32_t status) {
-///        if (status != PP_OK) {
-///          Cleanup();  // e.g. free user_data.
-///          return;
-///        }
-///        ... do your work...
-///      }
+///   @code
+///   void DoMyWork(void* user_data, int32_t status) {
+///     if (status != PP_OK) {
+///       Cleanup();  // e.g. free user_data.
+///       return;
+///     }
+///     ... do your work...
+///   }
+///   @endcode
 /// For a C++ example, see ppapi/utility/threading/simple_thread.h
 ///
 /// (You can also create the message loop resource on the background thread,
@@ -116,12 +121,12 @@ class InstanceHandle;
 /// Therefore, you should check for errors from PostWork and destroy any
 /// associated memory to avoid leaks. If you're using the C++
 /// CompletionCallbackFactory, use the following pattern:
-///
-///   pp::CompletionCallback callback = factory_.NewOptionalCallback(...);
-///   int32_t result = message_loop.PostWork(callback);
-///   if (result != PP_OK)
-///     callback.Run(result);
-///
+/// @code
+/// pp::CompletionCallback callback = factory_.NewOptionalCallback(...);
+/// int32_t result = message_loop.PostWork(callback);
+/// if (result != PP_OK)
+///   callback.Run(result);
+/// @endcode
 /// This will run the callback with an error value, and assumes that the
 /// implementation of your callback checks the "result" argument and returns
 /// immediately on error.