discrepancy between documenation of the `Limine5LevelPagingRequest` struct and documenation of 5-level paging in PROTOCOL.md of bootloader repo

[bindsdev]

In the documentation of the 5-level Paging Feature in the main bootloader repository, it states:

If the response pointer is changed to a valid pointer, 5-level paging is engaged.

However, in the documentation of the Limine5LevelPagingRequest struct it states:

If the response pointer is unchanged, 5-level paging is engaged.

This is a discrepancy that should be fixed to avoid any confusion.