More instructions on sphinx generation for extensions (#81)

scripts/refdoc/README.md

@@ -16,3 +16,11 @@ Scripts for reference documentation generation for Azure CLI Extensions using [s
 ## Retrieve output ##
 
 1. By default, the XML output is stored in `ref-doc-out-*/ind.xml`
+
+## Generating Sphinx output for the latest versions of all extensions in index ##
+
+1. Ensure the CLI is installed in your Python virtual environment.
+2. Inside the Python virtual environment, run `pip install sphinx==1.7.0`
+3. Set the environment variable `AZ_EXT_REF_DOC_OUT_DIR` to an empty directory that exists.
+4. Run the following script to generate sphinx output for the latest versions of all extensions in the index - `python ./scripts/ci/index_ref_doc.py -v`
+5. The sphinx output will be in the directory pointed to by the `AZ_EXT_REF_DOC_OUT_DIR` environment variable.