Fix typo in suggestion in iter_without_into_iter.rs

[DannyStoll1]

A small edit to fix a couple typos in the suggestion in iter_without_into_iter.

Fixes #11692.

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[y21]

FYI, there's already an open PR that addresses this (along with some other things mentioned in the linked issue, such as only linting if the type is exported): #11696

As for why this PR is failing checks, you need to update the tests locally that are now failing because of the change in the suggestion (just running cargo uibless should update everything), but not sure if it's worth having two PRs open to fix this?

[giraffate]

I'm closing this in favor of #11696.

Anyway, thanks for opening this!