docs: Fix a few typos

[timgates42]

There are small typos in:

• tests/qunit.js

Fixes:

• Should read prove rather than proove.
• Should read parameters rather than paramaters.
• Should read modifiers rather than modifers.
• Should read guarantee rather than gurantee.
• Should read annotation rather than annotaion.

Semi-automated pull request generated by https://github.com/timgates42/meticulous/blob/master/docs/NOTE.md