Updating docs for creating RSASigner from string (googleapis#213)

benedicteslee · Jon Wayne Parrott · commit 5d37a6492fe3 · 2017-11-10T13:48:59.000-08:00
diff --git a/google/auth/crypt/__init__.py b/google/auth/crypt/__init__.py
@@ -29,7 +29,7 @@
 To sign messages use :class:`RSASigner` with a private key::
 
     private_key = open('private_key.pem').read()
-    signer = crypt.RSASigner(private_key)
+    signer = crypt.RSASigner.from_string(private_key)
     signature = signer.sign(message)
 """
 
