message: Fixing casing of doc link
diff: - [Configure CMake Tools settings](docs/cmake-settings.md)
  - [How to](docs/how-to.md)
  - [FAQ](docs/faq.md)
  -- [Read the online documentation](docs/readme.md)
  +- [Read the online documentation](docs/README.md)
  - [Contribute](docs/contribute.md)
  ## Issues? Questions? Feature requests?
  