Update web3.eth.rst

Author: tmckenzie51

docs/web3.eth.rst

@@ -961,6 +961,7 @@ The following methods are available on the ``web3.eth`` namespace.
         nodes would result in an error like:  ``ValueError: {'code': -32602, 'message': 'too many arguments, want at most 1'}``
 
 .. py:method:: Eth.estimateGas(transaction, block_identifier=None)
+
     .. warning:: Deprecated: This property is deprecated in favor of
       :attr:`~web3.eth.Eth.estimate_gas()`