Update create_app_online.md

[jiacoALE]

Update iCloud parameters by "legacy" or "cloudkit" and remove deprecated values "xcode5_compatible" and "xcode6_compatible".

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

Description

Testing Steps

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[joshdholtz]

@jiacoALE Hello 👋 Do you mind signing the CLA so we can continue on reviewing this PR? 😇

[jiacoALE]

@googlebot I signed it!

[jiacoALE]

@jiacoALE Hello 👋 Do you mind signing the CLA so we can continue on reviewing this PR? 😇

Sorry ✌️ 😅