[stdlib] OptionSets - final pre-API-review tweaks
[stdlib] OptionSets - final pre-API-review tweaks

- Clarifies how bitwise operations are used to implement SetAlgebraType
  semantics in option sets.

- Adds a static `element(_, isDisjointWith:_)` method that reifies a
  term from documentation in code.

Swift SVN r28528

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