Spelling, grammatical or link updates
With this commit, I've fixed some broken links.
- [x] I have performed a self-review (valid links, formatting, spelling and grammar)
- [x] I have indicated whether I have any affiliation with any software/ services edited
- [x] I have read the [Contributing Guidelines](.github/CONTRIBUTING.md), and agree to follow the [Code of Conduct](/.github/CODE_OF_CONDUCT.md)