Mostly minor changes such as adding <code></code> around elements, a little rewriting, and a few ...

ppapi/c/pp_completion_callback.h

Index: ppapi/c/pp_completion_callback.h
===================================================================
--- ppapi/c/pp_completion_callback.h	(revision 91140)
+++ ppapi/c/pp_completion_callback.h	(working copy)
@@ -21,8 +21,14 @@
  */
 
 /**
- * PP_CompletionCallback_Func defines the signature that you implement to
+ * This typedef defines the signature that you implement to
  * receive callbacks on asynchronous completion.
+ *
+ * @param[in] user_data A pointer to user data passed to a callback function.
+ * @param[in] result If result is 0 (PP_OK), the operation succeeded.  Negative
+ * values (other than -1) indicate error and are specified in pp_errors.h.
+ * Positive values for result usually indicate success and have some
+ * operation-dependent meaning (such as bytes read).
  */
 typedef void (*PP_CompletionCallback_Func)(void* user_data, int32_t result);
 /**
@@ -35,22 +41,30 @@
  */
 
 /**
- * Any method that takes a PP_CompletionCallback has the option of completing
- * asynchronously if the operation would block.  Such a method should return
- * PP_OK_COMPLETIONPENDING to indicate that the method will complete
- * asynchronously and will always be invoked from the main thread of PPAPI
- * execution.  If the completion callback is NULL, then the operation will
- * block if necessary to complete its work.  PP_BlockUntilComplete() provides a
- * convenient way to specify blocking behavior. Refer to PP_BlockUntilComplete
- * for more information.
+ * Any method that takes a <code>PP_CompletionCallback</code> has the option of
+ * completing asynchronously if the operation would block.  Such a method
+ * should return <code>PP_OK_COMPLETIONPENDING</code> to indicate that the
+ * method will complete asynchronously and will always be invoked from the main
+ * thread of PPAPI execution.  If the completion callback is NULL, then the
+ * operation will block if necessary to complete its work.
+ * <code>PP_BlockUntilComplete()</code> provides a convenient way to specify
+ * blocking behavior. Refer to <code>PP_BlockUntilComplete</code> for more
+ * information.
  *
  * The result parameter passes an int32_t that, if negative or equal to 0,
- * indicate if the call will completely asynchronously (the callback will be
+ * indicate if the call will complete asynchronously (the callback will be
  * called with a status code). A value greater than zero indicates additional
  * information such as bytes read.
  */
 struct PP_CompletionCallback {
+  /**
+   * This value is a callback function that will be called.
+   */
   PP_CompletionCallback_Func func;
+
+  /**
+   * This value is a pointer to user data passed to a callback function.
+   */
   void* user_data;
 };
 /**
@@ -63,13 +77,15 @@
  */
 
 /**
- * PP_MakeCompletionCallback() is used to create a PP_CompletionCallback.
+ * PP_MakeCompletionCallback() is used to create a
+ * <code>PP_CompletionCallback</code>.
  *
- * @param[in] func A PP_CompletionCallback_Func that will be called.
+ * @param[in] func A <code>PP_CompletionCallback_Func</code> that will be
+ * called.
  * @param[in] user_data A pointer to user data passed to your callback
  * function. This is optional and is typically used to help track state
  * when you may have multiple callbacks pending.
- * @return A PP_CompletionCallback structure.
+ * @return A <code>PP_CompletionCallback</code> structure.
  */
 PP_INLINE struct PP_CompletionCallback PP_MakeCompletionCallback(
     PP_CompletionCallback_Func func,
@@ -91,7 +107,8 @@
 /**
  * PP_RunCompletionCallback() is used to run a callback.
  *
- * @param[in] cc A pointer to a PP_CompletionCallback that will be run.
+ * @param[in] cc A pointer to a <code>PP_CompletionCallback</code> that will be
+ * run.
  * @param[in] res The result parameter that, if negative or equal to 0,
  * indicate if the call will completely asynchronously (the callback will be
  * called with a status code). A value greater than zero indicates additional
@@ -117,24 +134,24 @@
  * until the function completes.  Blocking completion callbacks are only usable
  * from background threads.
  *
- * @return A PP_CompletionCallback structure.
+ * @return A <code>PP_CompletionCallback</code> structure.
  */
 PP_INLINE struct PP_CompletionCallback PP_BlockUntilComplete() {
   return PP_MakeCompletionCallback(NULL, NULL);
 }
 
 /**
- * Runs a callback and clears the reference to it.
+ * PP_RunAndClearCompletionCallback() runs a callback and clears the reference
+ * to that callback.
  *
- * This is used when the null-ness of a completion callback is used as a signal
- * for whether a completion callback has been registered. In this case, after
- * the execution of the callback, it should be cleared.
- *
- * However, this introduces a conflict if the completion callback wants to
- * schedule more work that involves the same completion callback again (for
- * example, when reading data from an URLLoader, one would typically queue up
+ * This function is used when the null-ness of a completion callback is used as
+ * a signal for whether a completion callback has been registered. In this
+ * case, after the execution of the callback, it should be cleared. However,
+ * this introduces a conflict if the completion callback wants to schedule more
+ * work that involves the same completion callback again (for example, when
+ * reading data from an URLLoader, one would typically queue up
  * another read callback). As a result, this function clears the pointer
- * *before* the given callback is executed.
+ * before the provided callback is executed.
  */
 PP_INLINE void PP_RunAndClearCompletionCallback(
     struct PP_CompletionCallback* cc,