#500 docs: index additional documentation pages

[Anonymous]

Originally created by: navaneethsankar07

Summary

• Added index entries for PLUGINS, RECOVERY, TELEMETRY, TUNING, and TURN_GATE.
• Kept each description focused on when a reader should open the document.
• Based the descriptions on each document's opening section.

Follow-up to [#409] .

[Anonymous]

Originally posted by: vinayjagan03

Only docs changes. plus all CI tests passed. good to go :)

[Anonymous]

Ticket changed by: vinayjagan03

• status: open --> closed

[Anonymous]

Originally posted by: fu351

Thanks @navaneethsankar07, in! Writing each row as "open this when..." instead of restating the doc's title is what makes an index useful, someone with a problem can scan it in five seconds. For a bigger docs piece, [#248] (level-4) is the OWASP-LLM / NIST AI RMF control-coverage matrix, it needs the same skill of mapping what the docs promise to where it's actually enforced.