Add config info into individual IdP setup sections.
Add both of following to `Set up [IdP]` sections:
- Step 1 in https://docs.gitlab.com/ee/user/group/saml_sso/index.html#configure-your-identity-provider.
- https://docs.gitlab.com/ee/user/group/saml_sso/index.html#metadata-configuration
Set up Azure - https://gitlab.com/gitlab-org/gitlab/-/merge_requests/114918
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