Fix the description of the $urltransform modifier and update the tracker bypass example

[ngorskikh]

Subj.

[Copilot]

Pull request overview

Updates the documentation for the $urltransform modifier to reflect its transformation pipeline behavior and refreshes the affiliate/tracker bypass examples accordingly.

Changes:

• Clarifies that $urltransform applies a series of transformations rather than a single regex replacement.
• уточняет (documents) execution order when multiple $urltransform rules match: applied sequentially in lexicographical order.
• Replaces the tracker-bypass example with modern pct/b64 transformation-based rules and adds a note about “Changing the origin”.

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[github-actions]

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