Add extra unchecked_disjoint_bitor implementations.

[bjoernager]

Tracking issue: #135758.

This PR implements the unchecked_disjoint_bitor method for additional types:

impl bool {
    pub const unsafe fn unchecked_disjoint_bitor(self, rhs: Self) -> Self;
}

impl i8 {
    pub const unsafe fn unchecked_disjoint_bitor(self, rhs: Self) -> Self;
}

impl i16 {
    pub const unsafe fn unchecked_disjoint_bitor(self, rhs: Self) -> Self;
}

impl i32 {
    pub const unsafe fn unchecked_disjoint_bitor(self, rhs: Self) -> Self;
}

impl i64 {
    pub const unsafe fn unchecked_disjoint_bitor(self, rhs: Self) -> Self;
}

impl i128 {
    pub const unsafe fn unchecked_disjoint_bitor(self, rhs: Self) -> Self;
}

impl isize {
    pub const unsafe fn unchecked_disjoint_bitor(self, rhs: Self) -> Self;
}

Our disjoint_bitor intrinsic is already implemented for these types. This method specifically is also already present on unsigned, integral types.

Additionally, this PR rewrites the existing docs for unchecked_disjoint_bitor and adds the must_use attribute to the method.

[rustbot]

r? @Mark-Simulacrum

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[bjoernager]

@rustbot label +T-libs-api -T-libs

r? libs-api

[bjoernager]

r? libs-api

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.