DOC: Silence traitlets nitpicky warning

docs/conf.py

@@ -91,14 +91,16 @@
     ('py:class', 'M'), ('py:class', 'N'), ('py:class', 'P'), ('py:class', '2'),
     ('py:class', 'optional'), ('py:class', 'array-like'), ('py:class', 'file-like object'),
     # For traitlets docstrings
-    ('py:class', 'All'), ('py:class', 'callable'),
+    ('py:class', 'All'), ('py:class', 't.Any'), ('py:class', 't.Iterable'),
     # Next two are from Python dict docstring that we inherit
     ('py:class', 'a shallow copy of D'),
     ('py:class', 'v, remove specified key and return the corresponding value.')
 ]
 
 nitpick_ignore_regex = [
     ('py:class', r'default:.*'),  # For some traitlets docstrings
+    ('py:class', r'.*Sentinel'),
+    ('py:class', r'.*[cC]allable'),
     ('py:class', r'.*object providing a view on.*'),  # Python dict docstring
     ('py:class', r'None.  .*'),  # Python dict docstring
     ('py:class', r'.*D\[k\].*'),  # Python dict docstring