Some more queue docs changes for v4

[matt-aitken]

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Latest commit: 831cc49

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Walkthrough

• docs/migrating-from-v3.mdx: Adds documentation on using concurrencyKey with trigger options to create per-key queues using the referenced queue’s concurrencyLimit. Provides an example using queue: "paid-users" and concurrencyKey: userId. Updates Lifecycle hooks to use a single destructured parameter object instead of multiple arguments, with updated examples.
• docs/queue-concurrency.mdx: Shifts examples from inline queue configuration objects to named queues referenced by string (e.g., "paid-users", "free-users"). Adds a paid queue definition example and shows reuse across tasks. Notes that underlying concurrency semantics are unchanged. Includes minor formatting updates.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

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📥 Commits

Reviewing files that changed from the base of the PR and between 0ae59cf and 831cc49.

📒 Files selected for processing (2)

• docs/migrating-from-v3.mdx (1 hunks)
• docs/queue-concurrency.mdx (6 hunks)

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