Fix bogus casing on the "setUp Thread Group" title.

[TeddMcAdams]

Description

I do not understand the current casing. Here is a fix that makes sense.

Motivation and Context

Because ew @ "setUp"

How Has This Been Tested?

Nah

Screenshots (if appropriate):

n/a

Types of changes

• Typo fix (non-breaking change which fixes an issue)

Checklist:

• [ x ] My code follows the code style of this project.
• [ x ] I have updated the documentation accordingly.