[NaCl SDK] A bunch of spelling fixes.

native_client_sdk/src/examples/hello_world_interactive/hello_world.cc

Index: native_client_sdk/src/examples/hello_world_interactive/hello_world.cc
diff --git a/native_client_sdk/src/examples/hello_world_interactive/hello_world.cc b/native_client_sdk/src/examples/hello_world_interactive/hello_world.cc
index 438b7bff0849590e92f6897957c237cff3e97132..de9541a5f3aad45328a6b46d3cb6d66a4cd4dd7e 100644
--- a/native_client_sdk/src/examples/hello_world_interactive/hello_world.cc
+++ b/native_client_sdk/src/examples/hello_world_interactive/hello_world.cc
@@ -94,7 +94,7 @@ void HelloWorldInstance::HandleMessage(const pp::Var& var_message) {
   }
   // Post the return result back to the browser.  Note that HandleMessage() is
   // always called on the main thread, so it's OK to post the return message
-  // directly from here.  The return post is asynhronous: PostMessage returns
+  // directly from here.  The return post is asynchronous: PostMessage returns
   // immediately.
   PostMessage(return_var);
 }