[stdlib] Fix doc comment refs to subranges(where:), now called indices(where:) #78512
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Doc comments for DiscontiguousSlice, MutableCollection, RangeSet, and RangeReplaceableCollection all refer to a Collection method subranges(where:) that is intended to return a RangeSet of matching ranges. I believe this is likely an old or formerly-contemplated spelling of the method now known as indices(where:). This commit changes "subranges" to "indices" in those comments.