PYTHON-980 - Document deprecation of the eval command

Author: behackett

pymongo/database.py

@@ -1037,6 +1037,9 @@ def eval(self, code, *args):
  evaluated
  - `args` (optional): additional positional arguments are
  passed to the `code` being evaluated
+
+ .. warning:: the eval command is deprecated in MongoDB 3.0 and
+ will be removed in a future server version.
  """
  if not isinstance(code, Code):
  code = Code(code)