Improve loops-step docs with output and clearer semantics#3568
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Expand the Loops Step section of the traversal reference so the example is self-explanatory. Clarify that loops() returns 0 before the first iteration and counts completed (0-based) iterations, explain that an emit() placed before repeat() is evaluated on every pass including the zeroth, note that the no-argument or() acts as an infix disjunction (cross-referencing the Or Step), and describe how the repeat() terminates when no times()/until() is given. Assisted-by: Kiro:claude-opus-4.8
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Expand the Loops Step section of the traversal reference so the example is self-explanatory. Clarify that loops() returns 0 before the first iteration and counts completed (0-based) iterations, explain that an emit() placed before repeat() is evaluated on every pass including the zeroth, note that the no-argument or() acts as an infix disjunction (cross-referencing the Or Step), and describe how the repeat() terminates when no times()/until() is given.