[DEGR-2545] Improve Functions docs (#1375)

cognite/client/_api/functions.py

@@ -112,6 +112,10 @@ def create(
         - If the user gives one or more secrets when creating the function, these are passed through the `secrets` argument.
         - Data about the function call can be accessed via the argument `function_call_info`, which is a dictionary with keys `function_id` and, if the call is scheduled, `schedule_id` and `scheduled_time`.
 
+        By default, the function is deployed with the latest version of cognite-sdk. If a specific version is desired, it can be specified either in a requirements.txt file when deploying via the `folder` argument or between `[requirements]` tags when deploying via the `function_handle` argument (see example below).
+
+        For help with troubleshooting, please see `this page. <https://docs.cognite.com/cdf/functions/known_issues/>`_
+
         Args:
             name (str): The name of the function.
             folder (str | None): Path to the folder where the function source code is located.