[Clang] Fix __is_trivially_equaltiy_comparable documentation (#88528)

Currently `__is_trivially_equality_comparable` is documented to return
true if comparing the value representation is equivalent to calling the
comparison operator, which is not quite what the trait actually checks.
The traits actually checks that comparing the object representation is
equivalent, which means that there cannot be padding bytes in the type.

GitOrigin-RevId: 9aa663bb9ef3dbab8ccc324ef3df5138aa458fbd
1 file changed