Docs: Add manual plugin linking instructions for SPM

[sfshaza2]

Fixes #12936. Adds a section to 'Swift Package Manager for plugin authors' explaining how to manually add a plugin as a local package dependency in Xcode, serving as a fallback when automatic linking fails.

[gemini-code-assist]

Summary of Changes

Hello @sfshaza2, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the documentation for Swift Package Manager plugin authors by introducing a comprehensive guide on manually adding a local plugin to an Xcode project. This new section provides a crucial workaround for scenarios where automatic plugin linking might encounter issues, ensuring developers have clear instructions to debug and integrate their plugins effectively.

Highlights

• Documentation Update: Added a new section to the 'Swift Package Manager for plugin authors' documentation, specifically addressing how to manually link a plugin.
• Manual Plugin Linking Instructions: Provided step-by-step instructions for manually adding a local plugin as a package dependency to an example app's Xcode project, serving as a fallback when automatic linking fails.

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[gemini-code-assist]

Code Review

This pull request adds documentation for manually linking a Swift Package Manager plugin in Xcode. The new section is clear and provides a useful fallback for developers. I've found a couple of issues: a stray HTML tag that could break page rendering, and an inconsistently formatted list. My review includes suggestions to fix these points. Overall, a good addition to the documentation.

[gemini-code-assist]

This extra </Tab> tag appears to be a mistake. The surrounding <Tabs> component has two opening <Tab> tags, but this change introduces a third closing </Tab> tag. This will likely break the rendering of the tabbed content on the page. Please remove this line.

[flutter-website-bot]

Visit the preview URL for this PR (updated for commit efc914f):

https://flutter-docs-prod--pr12979-fix-issue-12936-manual-plug-z86elowb.web.app

[camsim99]

@jmagman Can someone on the iOS team take a look at this?