Rollup merge of #151620 - vinDelphini:fix-typo-library-core, r=joboet

Fix 'the the' typo in library/core/src/array/iter.rs

This PR fixes a small grammatical error in a safety comment within `library/core/src/array/iter.rs` where the word "the" was duplicated.

No functional changes.

Author: matthiaskrgr