PYTHON-990: Fix argument name in notes

Author: bjori

pymongo/collection.py

@@ -1250,7 +1250,7 @@ def create_index(self, keys, **kwargs):
  using the option will fail if a duplicate value is detected.
 
  .. note:: `expireAfterSeconds` requires server version **>= 2.2**
- .. note:: `partialFilterIndexes` requires server version **>= 3.2**
+ .. note:: `partialFilterExpression` requires server version **>= 3.2**
 
  :Parameters:
  - `keys`: a single key or a list of (key, direction)

pymongo/operations.py

@@ -228,7 +228,7 @@ def __init__(self, keys, **kwargs):
  See the MongoDB documentation for a full list of supported options by
  server version.
 
- .. note:: `partialFilterIndexes` requires server version **>= 3.2**
+ .. note:: `partialFilterExpression` requires server version **>= 3.2**
 
  :Parameters:
  - `keys`: a single key or a list of (key, direction)