squash: Update API_TRANSITION_GUIDE.md

Co-authored-by: Lance Ball <[email protected]>

Author: lholmquist

API_TRANSITION_GUIDE.md

@@ -1,6 +1,6 @@
 ## Deprecated API Transition Guide
 
-When API's are deprecated, the following guide will show how to transition from removed API's to the new ones
+When APIs are deprecated, the following guide will show how to transition from removed API's to the new ones
 
 
 ### Upgrading From 3.x to 4.0