hint about the 'reason' and 'signature' property of the returnd error object added to the documentation

Author: nivida

docs/web3-eth-contract.rst

@@ -374,6 +374,8 @@ handleRevert
 
 The ``handleRevert`` options property does default to ``false`` and will return the revert reason string if enabled on :ref:`send <contract-send>` or :ref:`call <contract-call>` of a contract method.
 
+.. note:: The revert reason string and the signature does exist as property on the returned error.
+
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 Returns
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docs/web3-eth.rst

@@ -418,6 +418,7 @@ The ``handleRevert`` options property does default to ``false`` and will return
 - :ref:`contract.methods.myMethod(...).send(...) <contract-send>`
 - :ref:`contract.methods.myMethod(...).call(...) <contract-call>`
 
+.. note:: The revert reason string and the signature does exist as property on the returned error.
 
 -------
 Returns