Add call out that groups must match exactly

[kennyj42]

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Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.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.

[cloudflare-workers-and-pages]

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Original Link	Updated Link
https://developers.cloudflare.com/cloudflare-one/identity/idp-integration/generic-oidc/	https://kennyj42-patch-4.cloudflare-docs-7ou.pages.dev/cloudflare-one/identity/idp-integration/generic-oidc/
https://developers.cloudflare.com/cloudflare-one/identity/idp-integration/generic-saml/	https://kennyj42-patch-4.cloudflare-docs-7ou.pages.dev/cloudflare-one/identity/idp-integration/generic-saml/
https://developers.cloudflare.com/cloudflare-one/identity/idp-integration/jumpcloud-saml/	https://kennyj42-patch-4.cloudflare-docs-7ou.pages.dev/cloudflare-one/identity/idp-integration/jumpcloud-saml/