Fix Client.get_ident() example in docstring

raven.base.Client doesn't have a `process()` method.

raven/base.py

@@ -226,7 +226,7 @@ def get_ident(self, result):
         """
         Returns a searchable string representing a message.
 
-        >>> result = client.process(**kwargs)
+        >>> result = client.capture(**kwargs)
         >>> ident = client.get_ident(result)
         """
         return '$'.join(result)