Update index.mdx

[cf-scott]

As per https://jira.cfdata.org/browse/CUSTESC-60400

https://sourcegraph-oss.cfdata.org/gitlab.cfdata.org/cloudflare/www/gauss/-/blob/endpoint/scimgroup/scimgroup.go?L66:2

https://sourcegraph-oss.cfdata.org/gitlab.cfdata.org/cloudflare/www/gauss/-/blob/endpoint/scimgroup/endpoint.go?L380-381

Summary

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Documentation checklist

• Is there a changelog entry (guidelines)? If you don't add one for something awesome and new (however small) — how will our customers find out? Changelogs are automatically posted to RSS feeds, the Discord, and X.
• The change adheres to the documentation style guide.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.