register_state_check.h,cosmetics: fix some typos

Change-Id: I4a628999c126ac2e90e11b23c57338fa9614a562

test/register_state_check.h

diff --git a/test/register_state_check.h b/test/register_state_check.h
index 20fe88a..e9a7bf6 100644
--- a/test/register_state_check.h
+++ b/test/register_state_check.h
@@ -20,9 +20,8 @@
 
 // API_REGISTER_STATE_CHECK(function)
 //   Validates the environment pre & post function execution to ensure the
-//   environment is in a consistent state. This should be used with API
-//   function sand assembly functions which are not expected to fully restore
-//   the system state.
+//   environment is in a consistent state. This should be used with functions
+//   which are expected to fully restore the system state.
 //   See platform implementations of RegisterStateCheck and
 //   RegisterStateCheckMMX for details.