Remove FortUTF CMake 3.20 requirement in README (!58)

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## What is the bug
The CMake version requirement for FortUTF is downgraded to 3.17. Therefore, the line in README is no longer required.
## How do you fix it
A typo is also fixed.

## How urgent is the bugfix
- [ ] I need it as soon as possible
- [ ] I can wait for a couple of days
- [x] None of my current codes is directly affected

## Mandatory steps before review
- [x] Gitlab CI passes _(Hint: use `make format` for linting)_ 
- [x] Bugfix is covered by additional unit tests
- [x] Mark the merge request as ready by removing `Draft:`

## Mandatory steps before merge
- [x] Reviewed by a maintainer
- [x] Incorporate review suggestions
- [ ] Remember to edit the commit message and select the proper changelog category (feature/bugfix/other)

**You are not supposed to merge this request by yourself, the maintainers of fortan-support take care of this action!**

Approved-by: Jonas Jucker <jonas.jucker@env.ethz.ch>
Merged-by: Jonas Jucker <jonas.jucker@env.ethz.ch>
Changelog: other