Typo in namespaces section?

[natashawatkins]

Is the file here created meant to be called mathfoo.py not math2.py?

In the line:

To see this in action, suppose we write a script math2.py with a single line

[jstac]

Thanks @natashawatkins , appreciated. @HumphreyYang , can you please review and add a PR as required?