Refactoring: call_of_name -> call_of_leaf.

test/test_evaluate/test_helpers.py

@@ -4,7 +4,7 @@ from jedi import names
 from jedi.evaluate import helpers
 
 
-def test_call_of_name_in_brackets():
+def test_call_of_leaf_in_brackets():
     s = dedent("""
     x = 1
     type(x)
@@ -12,5 +12,5 @@ def test_call_of_name_in_brackets():
     last_x = names(s, references=True, definitions=False)[-1]
     name = last_x._name
 
-    call = helpers.call_of_name(name)
+    call = helpers.call_of_leaf(name)
     assert call == name