docs(code-security): fix advisory disclosure punctuation

[aniruddhaadak80]

Why:

Closes:

The “Importance of fix versions” section contains an extra comma after “to” in the sentence describing when to disclose an issue. Removing the stray comma restores the intended grammar without changing the guidance.

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

• Remove the stray comma from the sentence for an imminently available fix.
• No behavior or security guidance changes.
• Testing:
  • git diff --check — passed.
  • npm run lint-content -- --paths content/code-security/concepts/vulnerability-reporting-and-management/repository-security-advisories.md — blocked before execution because the sparse checkout has no tsx binary; installed Node is v22.23.2, while the repository requires ^24 || ^26.

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.

[github-actions]

How to review these changes 👓

Thank you for your contribution. To review these changes, choose one of the following options:

• Spin up a codespace
• Set up a local development environment

A Hubber will need to deploy your changes internally to review.

Table of review links

Note: Please update the URL for your staging server or codespace.

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
code-security/concepts/vulnerability-reporting-and-management/repository-security-advisories.md	fpt ghec	fpt ghec

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

🤖 This comment is automatically generated.

[subatoi]

This isn't incorrect I'm afraid, so I'm going to go ahead and close this out