clarify documentation

a few places still referred to MongoReplicaSetClient, and one place was
missing a link to PyMongo docs.

Author: dcrosta

docs/index.rst

@@ -136,9 +136,8 @@ Classes
 
    .. attribute:: cx
 
-      The :class:`~flask_pymongo.wrappers.MongoClient` or
-      :class:`~flask_pymongo.wrappers.MongoReplicaSetClient`, depending on
-      the type of connection described by the URI.
+      The :class:`~flask_pymongo.wrappers.MongoClient` connected to the
+      MongoDB server.
 
    .. attribute:: db
 

flask_pymongo/__init__.py

@@ -100,12 +100,6 @@ class PyMongo(object):
     variable, or as an argument to the constructor or ``init_app``. See
     :meth:`init_app` for more detail.
 
-    .. versionchanged:: 2.0
-
-       Flask-PyMongo no longer accepts many of the configuration variables
-       it did in previous versions. You must now use a MongoDB URI to
-       configure Flask-PyMongo.
-
     """
 
     def __init__(self, app=None, uri=None, *args, **kwargs):
@@ -118,12 +112,11 @@ def __init__(self, app=None, uri=None, *args, **kwargs):
     def init_app(self, app, uri=None, *args, **kwargs):
         """Initialize this :class:`PyMongo` for use.
 
-        Configure a :class:`~pymongo.mongo_client.MongoClient` or
-        :class:`~pymongo.mongo_replica_set_client.MongoReplicaSetClient`
+        Configure a :class:`~pymongo.mongo_client.MongoClient`
         in the following scenarios:
 
         1. If ``uri`` is not ``None``, pass the ``uri`` and any positional
-           or keyword arguments to MongoClient
+           or keyword arguments to :class:`~pymongo.mongo_client.MongoClient`
         2. If ``uri`` is ``None``, and a Flask config variable named
            ``MONGO_URI`` exists, use that as the ``uri`` as above.