docs: update offline cbc workflow to clarify proxy generation

doc/source/cbc_analysis.rst

@@ -118,16 +118,22 @@ for an injection-only workflow.
 
 If you already have a Makefile and need to update it based on an updated configuration, run ``gstlal_inspiral_workflow`` with ``--force``.
 
-Next, set up your proxy to ensure you can get access to LIGO data:
+Next, if you accessing non-public (GWOSC) data, you'll need to set up your proxy to ensure you can get access to LIGO data:
 
 .. code:: bash
 
-    $ ligo-proxy-init -p albert.einstein
-    $ make x509_proxy
+    $ X509_USER_PROXY=/path/to/x509_proxy ligo-proxy-init -p albert.einstein
 
 Note that we are running this step outside of Singularity. This is because ``ligo-proxy-init``
 is not installed within the image currently.
 
+Also update the configuration accordingly (if needed):
+
+.. code-block:: yaml
+
+    source:
+      x509-proxy: /path/to/x509_proxy
+
 If you haven't installed site-specific profiles yet, you can run:
 
 .. code:: bash