Table 6, union, intersection, and difference. Should that not be a period?

[daizenj]

What Course are you in
cpp4python

What Page were you on
Section 5.6

What is your username
njounkengdaizem

Describe the bug
In the use for union, intersection, and difference, you have an underscore. Should that not be a period?

Traceback
Section 5.6 > Table 6

[demekenega]

The methods in the table are correct union, intersection, and difference must be in the underscore.

@pearcej this issue can be closed.