DEV: (cmds) update FT.PROFILE and FT.HYBRID commands

[dwdougherty]

Redis 8.8 feature

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Note

Low Risk
Low risk: documentation-only updates that expand command syntax/description to cover FT.HYBRID profiling and the SHARD_K_RATIO option; no runtime code changes.

Overview
Docs update for Redis 8.8 search features. FT.PROFILE documentation is expanded to include profiling FT.HYBRID (syntax, descriptions, and cross-links).

FT.HYBRID docs now document the KNN option SHARD_K_RATIO (including syntax/description), and the vector-search guide adds an FT.HYBRID example using SHARD_K_RATIO for cluster tuning.

^{Reviewed by Cursor Bugbot for commit d487a33. Bugbot is set up for automated code reviews on this repo. Configure here.}

[github-actions]

DOC-6628

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6628/commands/ft.hybrid/
https://redis.io/docs/staging/DOC-6628/commands/ft.profile/
https://redis.io/docs/staging/DOC-6628/develop/ai/search-and-query/vectors/

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[mich-elle-luna]

thank you!

[dwdougherty]

Thanks for the review, @mich-elle-luna and @andy-stark-redis!

[andy-stark-redis]

LGTM