add core options ref (#2555)

* add core options ref

docs/python/documentation.md

@@ -33,14 +33,20 @@ As you write your code, *doc it so you never hear about it again.* The less ques
 
 {% include requirement/MUST id="python-docstrings-all" %} provide docstrings for all public modules, types, and methods.
 
-{% include requirement/MUST id="python-docstrings-kwargs" %} document any `**kwargs` directly consumed by a method. You may refer to the signature of a called method if the `**kwargs` are passed through.
+{% include requirement/MUST id="python-docstrings-kwargs" %} document any `**kwargs` directly consumed by a method and add a ref link to [core options](https://aka.ms/azsdk/python/options) to provide introduction for shared options. You may refer to the signature of a called method if the `**kwargs` are passed through.
 
 Example:
 ```python
 def request(method, url, headers, **kwargs): ...
 
 def get(*args, **kwargs):
-    "Calls `request` with the method "GET" and forwards all other arguments."
+    """Calls `request` with the method "GET" and forwards all other arguments.
+
+    :param str method-param: The method-param parameter
+    :keyword int method-kwarg: The optional method-kwarg parameter
+
+    For additional request configuration options, please see https://aka.ms/azsdk/python/options.
+    """
     return request("GET", *args, **kwargs)
 ```