Document let support for aggregation

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      PYTHON-2741 added test but we forgot to update the aggregate docs to mention this option. We should add this to Collection.aggregate and Database.aggregate:
      ```
      + - `let` (dict): A dict of parameter names and values. Values must be
      + constant or closed expressions that do not reference document
      + fields. Parameters can then be accessed as variables in an
      + aggregate expression context (e.g. ``"$$var"``). This option is
      + only supported on MongoDB >= 5.0.
      ```

            Assignee:
            Unassigned
            Reporter:
            Shane Harvey
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