squash: Update API_TRANSITION_GUIDE.md

Co-authored-by: Lance Ball <lball@redhat.com>
Signed-off-by: Lucas Holmquist <lholmqui@redhat.com>

Author: lholmquist

API_TRANSITION_GUIDE.md

@@ -1,6 +1,6 @@
 ## Deprecated API Transition Guide
 
-When APIs 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 APIs to the new ones
 
 
 ### Upgrading From 3.x to 4.0