Change SPF reference urls to point to MX toolbox features

[Stephen-McElroy]

Changed urls to point to MX toolbox features

• Give your PR a recognizable title. For example: "FE-123: Add new prop to component" or "Resolve Issue Create new-pricing-increases-costs #123: Fix bug in component"
• Your PR title will be visible in changelogs

What Changed

• What changes does this PR propose?
  Change SPF reference urls to point to MX toolbox features

How To Test or Verify

• Describe any steps that may help reviewers verify changes.
  Review help page for updated content
• Anything beyond basic unit testing, such as assistive tech usage, or special interactions.
  no

PR Checklist

Below are some checklists to follow for the correct procedure in different circumstance. The first list ("All PRs Checklist") should be followed for ALL PRs. The next 2 are additive to this list depending on what type of PR you are using.

For example: If you are submitting a content change to one of the support documents, your checklist would include the:

• "All PRs Checklist"
• AND the "Content Changes Checklist

If you are submitting a feature addition, enhancement, or bug fix, your checklist would include the:

• "All PRs Checklist"
• AND the "Development Changes Checklist"

All PRs Checklist

• Give your pull request a meaningful name.
• Use lowercase filenames.
• Apply at least one team label according to which team is the content expert (ie. team-FE or team-SAZ)
• Pull request approval from the FE team or content experts (see label applied above) that isn't the content creator.

Content Changes Checklist

• Check that your article looks correct in the preview here or in a Netlify deploy preview.
• Check the links in your article.
• Check the images in your article (if there are any)
• Check to make sure you are using markdown appropriately as outlined in examples/article.md in the root of the project directory and on the momentum doc's preface article
• Check to make sure the Copy and Tone Guidelines are followed.

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