Spelling error - Change JavaScript State "Managment" to JavaScript State "Management" in the heading (h1)

A really small spelling error on [JavaScript State Managment](https://frontendmasters.com/guides/learning-roadmap/js-state-management/) page in the heading. [Code change](https://github.com/FrontendMasters/learning-roadmap/blob/main/js-state-management/index.html#L24)