Update README.md

Author: jonas-schievink

README.md

@@ -40,7 +40,7 @@ Every nRF chip has its own crate, listed below:
 ## Development
 
 Be sure to copy and edit the `Cargo.example.toml` file to `Cargo.toml`. The file will require editing dependent on the target you wish to work with and contains some further
-instructions. Similarly, check out the `.vscode/settings.json` file when used in the context of Visual Studio Code. By default, all of theses files are configured to work
+instructions. Similarly, check out the `.vscode/settings.json` file when used in the context of Visual Studio Code. By default, all of these files are configured to work
 with the nRF52840 target.
 
 ## License