added info about swift dictionaries (#32512)
added info about swift dictionaries (#32512)

* added info about swift dictionaries

* added info for swift dictionaries

* added info about swift dictionaries

* added basic info on swift dictionaries

* added info about swift dictionaries

* Update index.md

* added info on swift dictionaries

* added info about swift dictionaries

* Update guide/english/swift/dictionaries/index.md

Co-Authored-By: Tom <9668706b580f833beaafb554e41033a7a167fff3@users.noreply.github.com>

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