Blazej Siejek

Thanks @wcarlsen, this should be added to the docs. Also wasted few hours to realise I missed the layout section.

Related to issue #295

@ankitdobhal could you please review and merge PR? thanks Can't add reviewers

@chawlaj100 mentioned I will be working on this in the issue description.

Getting 401s when running 2.3 on Amazon OpenSearch for `/_dashboards/_opendistro/_security/saml/acs` ``` {"statusCode":401,"error":"Unauthorized","message":"Unauthorized"} ``` and for `/_plugins/_security/saml/acs` ``` {"Message":"Your request: '/_plugins/_security/saml/acs' is not allowed."} ```