Add documentation for GetOptionContractsRequest (#626)

* Add documentation for GetOptionContractsRequest

Details of the GetOptionContractsRequest class should be included in the API docs

* Add documentation for OptionContract classes

Add documentation for OptionContract classes

* doc: adjust trading/models.rst

---------

Co-authored-by: hiohiohio <chihiro.hio@gmail.com>

Author: tnixon

docs/api_reference/trading/models.rst

@@ -84,3 +84,15 @@ CorporateActionAnnouncement
 ---------------------------
 
 .. autoclass:: alpaca.trading.models.CorporateActionAnnouncement
+
+
+OptionContract
+--------------
+
+.. autoclass:: alpaca.trading.models.OptionContract
+
+
+OptionContractsResponse
+-----------------------
+
+.. autoclass:: alpaca.trading.models.OptionContractsResponse

docs/api_reference/trading/requests.rst

@@ -68,6 +68,12 @@ StopLossRequest
 .. autoclass:: alpaca.trading.requests.StopLossRequest
 
 
+GetOptionContractsRequest
+-------------------------
+
+.. autoclass:: alpaca.trading.requests.GetOptionContractsRequest
+
+
 OptionLegRequest
 ----------------