docs: updates to documentation to cover the real time flags updates for iOS

[gazreese]

Thanks for submitting a PR! Please check the boxes below:

• [x] I have added information to docs/ if required so people know about the feature!
• [ ] I have filled in the "Changes" section below?
• [ ] I have filled in the "How did you test this code" section below?
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Changes

Added docs to cover the Real Time Flags feature for iOS as outlined here: https://github.com/Flagsmith/flagsmith-ios-client/pull/67

API KEY -> Environment

A couple of indentation issues.

How did you test this code?

Sufficient unit tests were added to the iOS repo.

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 10, 2024 9:57am

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