Update docstring.md (#33817)

Author: kristapratico

doc/dev/docstring.md

@@ -22,7 +22,10 @@ A method docstring is annotated by the Python long-string `"""<docstring>"""` ri
 
         The request must include a `training_files_url` parameter that is an
         externally accessible Azure storage blob container URI (preferably a Shared Access Signature URI). Note that
-        a container URI (without SAS) is accepted only when the container is public.
+        a container URI (without SAS) is accepted only when the container is public. 
+        See `SAS container details
+        <https://docs.microsoft.com/azure/cognitive-services/form-recognizer/build-training-data-set>`__
+        for more details.
         Models are trained using documents that are of the following content type - 'application/pdf',
         'image/jpeg', 'image/png', 'image/tiff', or 'image/bmp'. Other types of content in the container is ignored.
 
@@ -63,7 +66,7 @@ A method docstring is annotated by the Python long-string `"""<docstring>"""` ri
         ...
 ```
 
-The first portion of this docstring is a general description of what the method does. Following the general description of the method is a **required new line** and then documentation for each of the parameters, optional keyword arguments, returned objects, and potentially raised errors.
+The first portion of this docstring is a general description of what the method does. It contains a clickable link to MS documentation (note the special format and double-underscore necessary to make this work). Following the general description of the method is a **required new line** and then documentation for each of the parameters, optional keyword arguments, returned objects, and potentially raised errors.
 
 Positional parameters can be documented in one-line or two-lines. Both options can be used in a single docstring for documenting different parameters without issue.
 1. This option works best for parameters that are one of the basic types (`str`, `int`, `bool`, `bytes`, `float`, etc.)