Fix comment style in start-singleuser.py

Author: mathbunnyru

images/base-notebook/start-singleuser.py

@@ -12,8 +12,9 @@
 if "--ip=" not in os.environ.get("NOTEBOOK_ARGS", ""):
     command.append("--ip=0.0.0.0")
 
-# Append any optional NOTEBOOK_ARGS we were passed in. This is supposed to be multiple args passed
-# on to the notebook command, so we split it correctly with shlex
+# Append any optional NOTEBOOK_ARGS we were passed in.
+# This is supposed to be multiple args passed on to the notebook command,
+# so we split it correctly with shlex
 if "NOTEBOOK_ARGS" in os.environ:
     command += shlex.split(os.environ["NOTEBOOK_ARGS"])