added ideas on how to find object creation changes

Author: stephengaito

docs/TipsAndTricks/PopplerMethodSignaturesChange.md

@@ -17,3 +17,12 @@ of poppler at the new version. Once you have identified
 examples of the uses of the new method signatures, you
 can diff the poppler code between the two versions to
 see *how* the poppler programmers made the changes.
+
+## When object creation signatures change...
+
+When an object's creatino signature chagnes, it can be 
+rather harder to find example code... so instead of searching
+for the object creation (which can be difficult
+to identify using `grep`) try reading the code and find
+some associated method which *uses* the created object
+as a target of your `grep`ing command...