Update os-signals.mdx

[RyanGst]

What does this PR do?

Remove a loose section from os-signals documentation

How did you verify your code works?

Just a small documentation change.

[coderabbitai]

Walkthrough

Updated documentation to replace single "exit" event guidance with dual-event approach covering both "beforeExit" and "exit" events. Includes revised code samples and narrative flow reflecting Node.js lifecycle ordering.

Changes

Cohort / File(s)	Summary
OS Signal Event Guidance docs/guides/process/os-signals.mdx	Replaced "exit" event guidance with "beforeExit" and "exit" event handling; updated code samples and narrative flow to align with Node.js lifecycle

Pre-merge checks

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Title check	❓ Inconclusive	The title 'Update os-signals.mdx' is vague and generic, using non-descriptive language that doesn't convey what the actual change is.	Replace with a more specific title that describes the actual change, such as 'Update os-signals documentation to cover beforeExit and exit events' or 'Remove umbrella exit event guidance from os-signals'.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description includes both required template sections but lacks specific details about what was changed and why, making it incomplete.

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📥 Commits

Reviewing files that changed from the base of the PR and between cde167c and 2754e0b.

📒 Files selected for processing (1)

• docs/guides/process/os-signals.mdx (0 hunks)

💤 Files with no reviewable changes (1)

• docs/guides/process/os-signals.mdx

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[RyanGst]

@alii @dylan-conway