///
/// Since this method borrows `RefCell` mutably, it is statically guaranteed
/// that no borrows to the underlying data exist. The dynamic checks inherent
- /// in [`borrow_mut`] and most other methods of `RefCell` are therefor
+ /// in [`borrow_mut`] and most other methods of `RefCell` are therefore
/// unnecessary.
///
/// This method can only be called if `RefCell` can be mutably borrowed,