Docs: Crosslink "suggestions" information

What does this MR do?

The ability to make code suggestions is (IMO) buried too deeply in the "Comment creation" UI. However, if you know it exists and search for a how to, this page I am editing is high in the results and depending on your search term the page I am linking may not be in the hit list.

This page also mentions "suggestions" near the top - but does not provide any other information on them - possibly why it is getting a high SEO?

Related issues

Author's checklist (required)

• Follow the Documentation Guidelines and Style Guide.
• If you have Developer permissions or higher:
  • [x Ensure that the product tier badge is added to doc's h1.
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Do not add the feature, frontend, backend, ~"bug", or database labels if you are only updating documentation. These labels will cause the MR to be added to code verification QA issues.

When applicable:

• Update the permissions table.
• Link docs to and from the higher-level index page, plus other related docs where helpful.
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• Add GitLab's version history note(s).
• Add/update the feature flag section.

Review checklist

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1. Primary Reviewer

• Review by a code reviewer or other selected colleague to confirm accuracy, clarity, and completeness. This can be skipped for minor fixes without substantive content changes.

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• Technical writer review. If not requested for this MR, must be scheduled post-merge. To request for this MR, assign the writer listed for the applicable DevOps stage.
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For suggestions that you are confident don't need to be reviewed, change them locally and push a commit directly to save others from unneeded reviews. For example:

• Clear typos, like this is a typpo.
• Minor issues, like single quotes instead of double quotes, Oxford commas, and periods.

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3. Maintainer

1. Review by assigned maintainer, who can always request/require the above reviews. Maintainer's review can occur before or after a technical writer review.
2. Ensure a release milestone is set.
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