docs: alphabetize reason names

[setchy]

Why:

Two reasons were out of order - updated to alphabetize the list

What's being changed (if available, include any code snippets, screenshots, or gifs):

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[Copilot]

Pull Request Overview

This PR alphabetizes the notification reason names in the REST API documentation table to improve readability and organization. The changes ensure that the reason names are listed in proper alphabetical order.

• Moved comment reason from position 4 to position 5 (after ci_activity)
• Moved security_alert reason from position 10 to position 12 (after security_advisory_credit)

[github-actions]

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Table of review links

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
rest/activity/notifications.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Sharra-writes]

@setchy Looks good! Thanks for the correction.

[github-actions]

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