Docs are contradictory for radio/checkbox classes

Created by: TheSharpieOne

Slightly different from #20578 (closed) which is specific to inline and stacking, this ticket hopes to address the .form-check vs .radio and .checkbox classes.

The checkboxes and radios example uses the .form-check class exclusively while the validation example uses .radio and .checkbox exclusively. It is also worth noting that the validation styles for the label depend on the use of .radio and .checkbox

EDIT: Also affects disabled styles. The docs show both ways. Using .radio, as shown in the form controls example, does not make the label gray when disabled. Using .form-check does make the label gray when it is disabled` as seen in the using the grid example

.radio.disabled label .form-check.disabled .form-check-label