Update HTTPS docs link

Signed-off-by: Joffrey F <joffrey@docker.com>

docker/errors.py

@@ -80,8 +80,8 @@ class TLSParameterError(DockerException):
     def __str__(self):
         return self.msg + (". TLS configurations should map the Docker CLI "
                            "client configurations. See "
-                           "http://docs.docker.com/examples/https/ for "
-                           "API details.")
+                           "https://docs.docker.com/engine/articles/https/ "
+                           "for API details.")
 
 
 class NullResource(DockerException, ValueError):

docker/tls.py

@@ -13,7 +13,7 @@ class TLSConfig(object):
                  ssl_version=None, assert_hostname=None,
                  assert_fingerprint=None):
         # Argument compatibility/mapping with
-        # http://docs.docker.com/examples/https/
+        # https://docs.docker.com/engine/articles/https/
         # This diverges from the Docker CLI in that users can specify 'tls'
         # here, but also disable any public/default CA pool verification by
         # leaving tls_verify=False