PYTHON-1993 Add client-side field level encryption documentation examples

Specify pymongocrypt<2.0.0 in setup.py for compatibility.

Author: ShaneHarvey

doc/api/pymongo/encryption.rst

@@ -1,5 +1,5 @@
-:mod:`encryption` -- Client side encryption
-===========================================
+:mod:`encryption` -- Client-Side Field Level Encryption
+=======================================================
 
 .. automodule:: pymongo.encryption
    :members:

doc/api/pymongo/encryption_options.rst

@@ -1,8 +1,8 @@
-:mod:`encryption_options` -- Support for automatic client side encryption
+:mod:`encryption_options` -- Automatic Client-Side Field Level Encryption
 =========================================================================
 
 .. automodule:: pymongo.encryption_options
-   :synopsis: Support for automatic client side encryption
+   :synopsis: Support for automatic client-side field level encryption
 
    .. autoclass:: pymongo.encryption_options.AutoEncryptionOpts
       :members: