PYTHON-3033 Fix typo in uuid docs (#808)

doc/examples/uuid.rst

@@ -1,3 +1,4 @@
+
 .. _handling-uuid-data-example:
 
 Handling UUID Data
@@ -12,7 +13,7 @@ to MongoDB and retrieve them as native :class:`uuid.UUID` objects::
   from uuid import uuid4
 
   # use the 'standard' representation for cross-language compatibility.
-  client = MongoClient(uuid_representation=UuidRepresentation.STANDARD)
+  client = MongoClient(uuidRepresentation='standard')
   collection = client.get_database('uuid_db').get_collection('uuid_coll')
 
   # remove all documents from collection

pymongo/mongo_client.py

@@ -325,9 +325,9 @@ class MongoClient(common.BaseObject):
             speed. 9 is best compression. Defaults to -1.
           - `uuidRepresentation`: The BSON representation to use when encoding
             from and decoding to instances of :class:`~uuid.UUID`. Valid
-            values are `pythonLegacy`, `javaLegacy`, `csharpLegacy`, `standard`
-            and `unspecified` (the default). New applications
-            should consider setting this to `standard` for cross language
+            values are the strings: "standard", "pythonLegacy", "javaLegacy",
+            "csharpLegacy", and "unspecified" (the default). New applications
+            should consider setting this to "standard" for cross language
             compatibility. See :ref:`handling-uuid-data-example` for details.
           - `unicode_decode_error_handler`: The error handler to apply when
             a Unicode-related error occurs during BSON decoding that would