[DOC] Add 'In brief' for Array#[] #10190
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The added 'In brief' section (near the very beginning) shows examples of the simplest and commonest uses of method Array[]. The idea is to answer as many user questions as possible in the least possible space: a sort of micro-reference for the method.
The already-existing and extensive discussion that follows gives details and further examples, for those who want/need that.