docs: document additional OIDC environment variables

[sebastianiv21]

Description

• Adds reference entries for the six previously undocumented OIDC environment variables.
• Maps OIDC endpoint variables to discovery-document fields and links to provider-specific setup guides.

Pull request type

Check the appropriate box:

• Review Fixes
• Documentation Overhaul
• Feature/Story
  • Link one or more Engineering Tickets
    *
• A-Force
• Error in documentation
• Maintenance

Documentation tickets

• N/A

Checklist

From the below options, select the ones that are applicable:

• Checked for Grammarly suggestions.
• Adhered to the writing checklist.
• Adhered to the media checklist.
• Verified and updated cross-references or added redirect rules.
• Tested the redirect rules on deploy preview.
• Validated the modifications made to the content on the deploy preview.
• Validated the CSS modifications on different screen sizes.

Validation

• Focused Vale check: 0 errors and 0 warnings.
• Docusaurus production build completed successfully; existing repository-wide broken-anchor warnings remain unchanged.

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Project	Deployment	Actions	Updated (UTC)
appsmith-docs	Ready	Preview	Aug 21, 2026 3:53pm

[salevine]

LGTM