Clean up formatting to simplify post-Doxygen processing.

ppapi/api/pp_completion_callback.idl

Index: ppapi/api/pp_completion_callback.idl
diff --git a/ppapi/api/pp_completion_callback.idl b/ppapi/api/pp_completion_callback.idl
index 46b6342aa2b83b6a53579f66162bef57636f343b..72aed837704b6ed4b5ab679623f54e0ba0c0329f 100644
--- a/ppapi/api/pp_completion_callback.idl
+++ b/ppapi/api/pp_completion_callback.idl
@@ -70,7 +70,7 @@ enum PP_CompletionCallback_Flag {
  *               callback, and the callback will be invoked later (barring
  *               system or thread shutdown; see PPB_MessageLoop for details).
  *               Required callbacks are the default.
- *
+ *               <br /><br />
  *               NOTE: If you use a required callback on a background thread,
  *               you must have created and attached a PPB_MessageLoop.
  *               Otherwise, the system can not run your callback on that thread,
@@ -87,7 +87,7 @@ enum PP_CompletionCallback_Flag {
  *               callbacks, but can provide better performance for some APIs
  *               (especially APIs with buffered reads, such as PPB_URLLoader or
  *               PPB_FileIO).
- *
+ *               <br /><br />
  *               NOTE: If you use an optional callback on a background thread,
  *               and you have not created and attached a PPB_MessageLoop, then
  *               the method you invoke will fail without running and return
@@ -98,10 +98,10 @@ enum PP_CompletionCallback_Flag {
  *               run to completion and return an appropriate code when finished
  *               (see below for more information). Blocking completion
  *               callbacks are only supported on background threads.
- *
+ *               <br /><br />
  *               <code>PP_BlockUntilComplete()</code> provides a convenient way
  *               to specify blocking behavior. Refer to
- *                <code>PP_BlockUntilComplete</code> for more information.
+ *               <code>PP_BlockUntilComplete</code> for more information.
  *
  * When the callback is run asynchronously, the result parameter passed to
  * <code>func</code> is an int32_t that, if negative indicates an error code