Add SAML example to docs

[jonathanfrappier]

Moving contributed tutorial to Vault docs per Slack conversation.

[digital-content-events]

📄 Content Checks

Updated: Fri, 17 May 2024 20:47:58 GMT

Found 2 error(s)

content/docs/auth/saml/adfs.mdx

Position	Description	Rule
738:3-738:89	Unexpected fully-qualified link to developer.hashicorp.com: https://developer.hashicorp.com/vault/docs/auth/saml. Replace with a relative path internal to Developer. Possibly: /vault/docs/auth/saml.	ensure-valid-link-format
739:3-739:85	Unexpected fully-qualified link to developer.hashicorp.com: https://developer.hashicorp.com/vault/api-docs/auth/saml. Replace with a relative path internal to Developer. Possibly: /vault/api-docs/auth/saml.	ensure-valid-link-format

[github-actions]

CI Results:
All Go tests succeeded! ✅