Update API Documentation

The API documentation in the current state is very outdated. There are actions in the system that are not mentioned in the documentation, e.g. Holiday endpoint has a GetAllHolidayDetail Action which is never mentioned in the documentation, but is very useful, so you sometimes need to guess what parameters can be provided to filter the information you want.

The CheckAuthentication action on Employee endpoint doesn't seem to work correctly, as it always says the email and password are incorrect, even regardless if the details are correct or not. Not sure if this is due to MFA or something else, the docs never mentions if it should work with MFA.

It makes it unnecessarily painful to work with the API.