manual_div_ceil: fix suggestions when macro is involved

[Kivooeo]

here is my small fix

changelog: fix suggestion span to avoid showing macro name in .div_ceil() suggestion

i changed this line
let divisor_snippet = snippet_with_applicability(cx, rhs.spansource_callsite(), "..", applicability);
to this line
let divisor_snippet = snippet_with_applicability(cx, rhs.span, "..", applicability);
to fix problem where this warning in macro expands like this

4  |         let _ = (x + 7) / 8;
   |                 ^^^^^^^^^^^ help: consider using `.div_ceil()`: `x.div_ceil(y!())`

play it yourself

as you can see here it looks like x.div_ceil(y!()) and contains macro signature
so i fixed this problem, i will look closely if there any more problems like this and fix them in order

Related issue

fixes rust-lang/rust-clippy#14665

[rustbot]

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[dswij]

Welcome to clippy @Kivooeo! :)

Just some meta information on opening PRs for Clippy:

1. the changelog should be a summary of what the PR changes.
2. if the PR will close the issue, it's preferable to write fixes ${issue_number} so the issue will be automatically closed once the PR is merged.

There is no need to cc the issue author unless necessary. We'd want to minimize ping for other people.

[Kivooeo]

@dswij thanks for the quick review, check this changes ive made, is this any better or need any corrections?

[Kivooeo]

@dswij should be done, double check everything pls

[Kivooeo]

@rustbot ready

[dswij]

Thank you! @Kivooeo