Cleaning up and adding new docs

ppapi/c/pp_stdint.h

Index: ppapi/c/pp_stdint.h
===================================================================
--- ppapi/c/pp_stdint.h	(revision 74025)
+++ ppapi/c/pp_stdint.h	(working copy)
@@ -7,8 +7,9 @@
 
 /**
  * @file
- * Provides a definition of C99 sized types
- * across different compilers.
+ * This file provides a definition of C99 sized types
+ * for Microsoft compilers. These definitions only apply
+ * for trusted modules.
  */
 
 /**
@@ -18,13 +19,28 @@
  */
 #if defined(_MSC_VER)
 
+/** This value represents a guaranteed unsigned 8 bit integer. */
 typedef unsigned char uint8_t;
+
+/** This value represents a guaranteed signed 8 bit integer. */
 typedef signed char int8_t;
+
+/** This value represents a guaranteed unsigned 16 bit short. */
 typedef unsigned short uint16_t;
+
+/** This value represents a guaranteed signed 16 bit short. */
 typedef short int16_t;
+
+/** This value represents a guaranteed unsigned 32 bit integer. */
 typedef unsigned int uint32_t;
+
+/** This value represents a guaranteed signed 32 bit integer. */
 typedef int int32_t;
+
+/** This value represents a guaranteed signed 64 bit integer. */
 typedef __int64 int64_t;
+
+/** This value represents a guaranteed unsigned 64 bit integer. */
 typedef unsigned __int64 uint64_t;
 /**
  * @}