Fix reference to private urllib3.util.ssl_ module in custom context example
@@ -619,7 +619,7 @@ flag that isn't set by default, and then makes a HTTPS request:
import ssl
from urllib3 import PoolManager
- from urllib3.util.ssl_ import create_urllib3_context
+ from urllib3.util import create_urllib3_context
ctx = create_urllib3_context()
ctx.load_default_certs()
