DOC: Added a section in the 'Iterating over arrays' doc page on basic iteration. #16760
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It seems strange that basic iteration over arrays is covered only in the Quickstart Tutorial and not mentioned in the reference doc page titled "Iterating Over Arrays". I normally only use the reference section and spent about ten minutes trying to remind myself of how basic iteration works/wondering if it had been removed in an update. This pull request adds a section on basic iteration and moves everything that was there down one header level.