Fix typos

[andgdk]

Motivation

Correct spelling in readme, commands, symbols, parameters, and tests.
The second commit addresses a build error, as type inference was missing.

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

[IvanKiral]

Thanks for finding all the typos! It seems I would need to have Grammarly in my IDE. Left the comments for type interference tho, we don't use any in this codebase unless necessary. Can you please explain why it is needed?

[andgdk]

Motivation

[...] The second commit addresses a build error, as type inference was missing.

Not sure why this was. I will investigate further and undo those changes.

[andgdk]

@IvanKiral Made the requested change. Thanks for taking the time to review. I end up with typos myself even with tooling - but yes, can be a life saver :)