message: fix format string.
diff: @@ -116,7 +116,7 @@ def generate_raw_ops_doc():
  has_gradient = "\N{CROSS MARK}"
  link = (
  '<a id={op_name} href="{FLAGS.site_path}/api_docs/python/tf/raw_ops">'
  - '{op_name}</a>').format(op_name=op_name, FLAGS=FLAGS.site_path)
  + '{op_name}</a>').format(op_name=op_name, FLAGS=FLAGS)
  parts.append(
  "| {link} | {has_gradient} |".format(link=link,
  has_gradient=has_gradient))
  