fix roundtrip code example path

Author: Wumpf

docs/code-examples/roundtrips.py

@@ -12,7 +12,7 @@
 from os import listdir
 from os.path import isfile, join
 
-sys.path.append(os.path.dirname(os.path.realpath(__file__)) + "/../scripts/")
+sys.path.append(os.path.dirname(os.path.realpath(__file__)) + "/../../scripts/")
 from roundtrip_utils import cmake_build, cmake_configure, cpp_build_dir, roundtrip_env, run, run_comparison  # noqa
 
 # fmt: off