docs: drop appiumpro.com references

[alaahong]

Summary

Removes appiumpro.com references from this repository, since the domain is no longer maintained by the Appium team (see appium/appium#22499).

Follows the same approach as appium/appium#22500 — links are removed rather than replaced, unless removal would break surrounding prose, in which case the URL is inlined as plain text.

Closes appium/appium#22499

Checklist

• I have read the Contributing Guide
• I have signed the CLA
• Lint and unit tests pass locally with my changes
• No documentation update needed (only stale links removed)

[Copilot]

Pull request overview

Updates inline documentation in the .NET client to remove an external appiumpro.com reference and keep the DirectConnect property docs self-contained.

Changes:

• Remove the https://appiumpro.com/... URL from the DirectConnect XML documentation and replace it with a plain description.
• Normalize the file header’s first line (removes the stray leading character/formatting artifact).

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[KazuCocoa]

We need to have alternative documentation for them instead of simple drop for individual pages

[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

[alaahong]

We need to have alternative documentation for them instead of simple drop for individual pages

Get the point. Caused that's the legacy link, seems no need to create new doc file into Appium docs? just replace with new link for same content reference.