Minor typo in PaywallColor docs

[JayShortway]

• [x] I have updated Purchases SDK to the latest version
• [x] I have read the Contribution Guidelines
• [x] I have searched the Community
• [x] I have read docs.revenuecat.com
• [x] I have searched for existing Github issues

Describe the bug Hi all,

I noticed a very minor typo in the docs of PaywallColor: #RRGGBBAA should have been #AARRGGBB, according to the docs of the underlying API being used (Color.parseColor()).

I have a PR ready to be merged, but feel free to close this if it has no priority of course.

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[JayShortway]

Fixed by #1649.

[github-actions[bot]]

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