update groups attribute name for google SAML config

[robotmiller]

What are you changing in this pull request and why?

Google's docs say MemberOf so that's likely why we had it this way, but this value is the actual attribute name in the SAML response so we want it to be called groups.

Checklist

• Review the Content style guide and About versioning so my content adheres to these guidelines.
• Add a checklist item for anything that needs to happen before this PR is merged, such as "needs technical review" or "change base branch."

Adding new pages (delete if not applicable):

• Add page to website/sidebars.js
• Provide a unique filename for the new page

Removing or renaming existing pages (delete if not applicable):

• Remove page from website/sidebars.js
• Add an entry website/static/_redirects
• Ran link testing to update the links that point to the deleted page

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[mirnawong1]

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