Clarify Flutter SDK requirement in Android setup

[sfshaza2]

Fixes #12837

[gemini-code-assist]

Summary of Changes

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This pull request significantly improves the clarity of the Android setup documentation by transforming a general note into a prominent warning. It explicitly details the crucial requirement of installing the Flutter SDK and configuring its PATH, addressing a common point of confusion where users might mistakenly rely solely on the Android Studio plugin. This change aims to streamline the setup process and prevent potential issues for developers integrating Flutter with Android.

Highlights

• Documentation Clarity: The existing 'note' regarding Flutter setup in the Android integration guide has been upgraded to a 'warning' to emphasize its importance.
• Explicit SDK Requirement: Added explicit clarification that installing the Flutter SDK and adding it to the system PATH is mandatory, and that the Android Studio plugin alone is insufficient.
• Structural Refinement: The instruction to ensure Flutter is up to date has been moved into its own distinct 'note' block for better readability and separation of concerns.

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[gemini-code-assist]

Code Review

This pull request clarifies a crucial point for new Flutter developers setting up their Android environment: the Flutter SDK must be installed separately from the Android Studio plugin. The change uses a warning block to emphasize this, which is a great improvement. I've added one suggestion to make the instructions about updating the PATH even more precise.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit 70a6b7a):

https://flutter-docs-prod--pr12848-fix-android-setup-instructi-xf2nqxf0.web.app