Added Capitalize in Swift

[BradyLeg]

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I Am Adding a New Code Snippet in an Existing Language

• I fixed Add Capitalize in Swift #4470
• I did not include any extra folders/libraries
• I named the pull request using Add {PROJECT} in {LANGUAGE} format

[github-actions]

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[github-advanced-security]

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[rzuckerm]

All the tests are failing.

[rzuckerm]

Close due to a month of inactivity.