There is no print() method in FunctorCollection

Instead there is str, so I changed the documentation.

Phys/FunTuple/python/FunTuple/FunctorCollection.py

@@ -24,7 +24,7 @@ class FunctorCollection():
         __getitem__: Dictionary like get item
         update : extends a given dictionary of functors to the collection, throwing a warning about overwriting an entry if it already exists.
         pop : given a name or list of names it removes the functors from the collection, raising an error if the entry(ies) does(do) not exist.
-        print  : prints the content of FunctorCollection.
+        __str__  : helper to print the collection
         add operator (+) : adds two FunctorCollection, for common entries warns the user about picking the entry from "base" FunctorCollection instance.
         sub operator (-) : returns a FunctorCollection that contains unique entries between two FunctorCollections.
         get_loki_functors(self): returns dictionary of loki functors