Updated documentation for SSL client cert usuage.

Co-Authored By: Timnit Gebru <tgebru@gmail.com>
Co-Authored By: Sarah Gonzalez <smar.gonz@gmail.com>
Co-Authored By: Victoria Mo <vm2355@columbia.edu>

AUTHORS.rst

@@ -105,3 +105,7 @@ Patches and Suggestions
 - Danilo Bargen (gwrtheyrn)
 - Torsten Landschoff
 - Michael Holler (apotheos)
+- Timnit Gebru
+- Sarah Gonzalez
+- Victoria Mo
+- Leila Muhtasib

docs/user/advanced.rst

@@ -93,6 +93,23 @@ I don't have SSL setup on this domain, so it fails. Excellent. Github does thoug
 
 You can also pass ``verify`` the path to a CA_BUNDLE file for private certs. You can also set the ``REQUESTS_CA_BUNDLE`` environment variable.
 
+Requests can also ignore verifying the SSL certficate if you set ``verify`` to False.
+
+    >>> requests.get('https://kennethreitz.com', verify=False)
+    <Response [200]>
+
+By default, ``verify`` is set to True. Option ``verify`` only applies to host certs.
+
+You can also specify the local cert file either as a path or key value pair::
+
+    >>> requests.get('https://kennethreitz.com', cert=('/path/server.crt', '/path/key'))
+    <Response [200]>
+
+If you specify a wrong path or an invalid cert::
+
+    >>> requests.get('https://kennethreitz.com', cert='/wrong_path/server.pem')
+    SSLError: [Errno 336265225] _ssl.c:347: error:140B0009:SSL routines:SSL_CTX_use_PrivateKey_file:PEM lib
+
 
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