feat: Updated docs for implicit and auth code flow sso

[tarunpandey23]

Describe your changes:

Fixes #16124

I worked on updating the documentation related to SSO security. The existing documentation only mentions the implicit flow for SSO, but both the implicit flowand the auth code flow can be used. To provide more clarity on how the auth code flow works, I focused on writing additional documentation for it.

Here is some of the Pictures of the Changes that i made to the documentation.

Type of change:

• Bug fix
• Improvement
• New feature
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation

Checklist:

• I have read the CONTRIBUTING document.
• My PR title is Fixes <issue-number>: <short explanation>
• I have commented on my code, particularly in hard-to-understand areas.
• For JSON Schema changes: I updated the migration scripts or explained why it is not needed.

[github-actions]

Hi there 👋 Thanks for your contribution!

The OpenMetadata team will review the PR shortly! Once it has been labeled as safe to test, the CI workflows
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[Prajwal214]

Approved