docs: correct Fabric dependency provider requirement to React Native 0.77

[jamesnrokt]

Summary

The Fabric dependency provider is required from React Native 0.77, not 0.76.
RCTDependencyProvider, the ReactAppDependencyProvider pod, and
RCTAppDelegate.dependencyProvider are all absent at v0.76.0 and added at
v0.77.0, where thirdPartyFabricComponents starts consulting the provider.

Corrects the version in the sample AppDelegate comment and the matching iOS
setup callout in the README, both of which contradicted MIGRATING.md. The
>= 0.76.0 peer dependency floor is a separate claim and is unchanged.

Testing Plan

Comment and prose only, no code paths touched. Prettier and markdownlint pass
with no new issues.

[cursor]

PR Summary

Low Risk
Documentation and sample comments only; no runtime or build behavior changes.

Overview
Updates iOS setup guidance so the Fabric dependency provider (RCTAppDependencyProvider / self.dependencyProvider) is documented as required from React Native 0.77+, not 0.76+.

The README callout and the comment in sample/ios/MParticleSample/AppDelegate.mm now match MIGRATING.md, which notes those APIs and thirdPartyFabricComponents integration arrive in 0.77. The peer dependency floor (>= 0.76.0) is unchanged.

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[Copilot]

🟢 Approval recommended

The changes are comment/prose-only and make the documentation consistent with the existing migration guidance.

Pull request overview

Updates the project documentation to correctly state that the iOS Fabric dependency provider requirement begins in React Native 0.77 (not 0.76), aligning the sample code comment and README guidance with MIGRATING.md.

Changes:

• Update the sample iOS AppDelegate comment to say “Required since React Native 0.77”.
• Update the README iOS setup callout to say “React Native 0.77+ requires a Fabric dependency provider”.

File summaries

File	Description
sample/ios/MParticleSample/AppDelegate.mm	Corrects the inline comment about when dependencyProvider becomes required.
README.md	Corrects the iOS setup callout to match the 0.77 requirement described in migration guidance.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 0
• Review effort level: Lite

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