Fix typos in tools/test_history.py helpstring (#52840)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/52840
Test Plan:
```
$ tools/test_history.py --help
```
Reviewed By: janeyx99
Differential Revision: D26665121
Pulled By: samestep
fbshipit-source-id: 3607a4a598f1b1639ac1752b4e377491bff7188f
