[Android] Updating breaking change page on restricting engine config flags

[camsim99]

Description of what this PR is changing or adding, and why:
Adds some corrections +renames to a breaking change page on restricting engine config flags for Android.

Issues fixed by this PR (if any):
Part of flutter/flutter#190461

PRs or commits this PR depends on (if any):
flutter/flutter#191924 (but this can land at any time)

Presubmit checklist

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• This PR follows the Google Developer Documentation Style Guidelines—for example, it doesn't use i.e. or e.g., and it avoids I and we (first-person pronouns).
• This PR uses semantic line breaks
  of 80 characters or fewer.

[flutter-website-bot]

Staged preview of the updated docs.flutter.dev site (updated for commit 631bff0):

https://flutter-docs-prod--docs-pr13931-update-intent-bcp-30cl88l4.web.app