[BUG] Connect Self managed dashboards domain should mention to modify the SAML config

[derek-ho]

Describe the bug

In this section: Setting up a self-managed Dashboards instance in an EC2-hosted container: SAML authentication

Of this blog: https://opensearch.org/blog/A-comprehensive-guide-to-setup-and-connect-self-managed-dashboards-with-Amazon-OpenSearch-domain/, it mentions to follow SAML setup like usual from AWS docs, but this is misleading because that will setup SAML with _dashboards basepath, when that is not necessarily their basepath used on their own OSD instance. This should be called out.

Expected behavior

In this section: Setting up a self-managed Dashboards instance in an EC2-hosted container: SAML authentication

Of this blog: https://opensearch.org/blog/A-comprehensive-guide-to-setup-and-connect-self-managed-dashboards-with-Amazon-OpenSearch-domain/, it mentions to follow SAML setup like usual from AWS docs, but this is misleading because that will setup SAML with _dashboards basepath, when that is not necessarily their basepath used on their own OSD instance. This should be called out.

Screenshots

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[pajuric]

@derek-ho - Looks like this is a blog that was opened in the wrong issue template. If possible, can you close this request and reopen it using this template: https://github.com/opensearch-project/project-website/issues/new?assignees=&labels=new+blog%2C+enhancement%2C+untriaged&projects=opensearch-project%2FDigital+Marketing+Content&template=blog_post.yml&title=%5BBLOG%5D+%3Ctitle%3E