Update platform handle (private) API "documentation"/comments.

mojo/public/platform/native/platform_handle_private_thunks.c

Index: mojo/public/platform/native/platform_handle_private_thunks.c
diff --git a/mojo/public/platform/native/platform_handle_private_thunks.c b/mojo/public/platform/native/platform_handle_private_thunks.c
index 9c0b35b70120878197fb3f306ed4d8dbc05830c4..b10607e3d190fc7947727e219ffc5fa3e53acd1e 100644
--- a/mojo/public/platform/native/platform_handle_private_thunks.c
+++ b/mojo/public/platform/native/platform_handle_private_thunks.c
@@ -10,16 +10,19 @@
 
 static struct MojoPlatformHandlePrivateThunks g_thunks = {0};
 
-MojoResult MojoCreatePlatformHandleWrapper(MojoPlatformHandle platform_handle,
-                                           MojoHandle* wrapper) {
+MojoResult MojoCreatePlatformHandleWrapper(
+    MojoPlatformHandle platform_handle,
+    MojoHandle* platform_handle_wrapper_handle) {
   assert(g_thunks.CreatePlatformHandleWrapper);
-  return g_thunks.CreatePlatformHandleWrapper(platform_handle, wrapper);
+  return g_thunks.CreatePlatformHandleWrapper(platform_handle,
+                                              platform_handle_wrapper_handle);
 }
 
-MojoResult MojoExtractPlatformHandle(MojoHandle wrapper,
+MojoResult MojoExtractPlatformHandle(MojoHandle platform_handle_wrapper_handle,
                                      MojoPlatformHandle* platform_handle) {
   assert(g_thunks.ExtractPlatformHandle);
-  return g_thunks.ExtractPlatformHandle(wrapper, platform_handle);
+  return g_thunks.ExtractPlatformHandle(platform_handle_wrapper_handle,
+                                        platform_handle);
 }
 
 THUNK_EXPORT size_t MojoSetPlatformHandlePrivateThunks(
@@ -27,4 +30,4 @@ THUNK_EXPORT size_t MojoSetPlatformHandlePrivateThunks(
   if (thunks->size >= sizeof(g_thunks))
     g_thunks = *thunks;
   return sizeof(g_thunks);
-}
+}