docs: add Apache APISIX to the rate limiter ecosystem

[Yilialinn]

Summary

Add Apache APISIX to the API gateway entries in the Redis rate-limiter ecosystem list.

The linked APISIX limit-count documentation describes Redis and Redis Cluster counter policies and includes an example in which multiple APISIX nodes share a rate-limiting quota through Redis.

Scope

• Update one ecosystem-list entry.
• Link to the official Apache APISIX plugin documentation.
• Do not change Redis behavior, examples, or recommendations.

Validation

• Confirmed that the target Redis page already lists API gateways that use Redis for distributed rate limiting.
• Confirmed that Apache APISIX 3.17 documents redis and redis-cluster policies for limit-count.
• Confirmed that the APISIX documentation contains a cross-node shared-quota example.
• Applied the patch to Redis main at e8c5782b614482976bd5da66f23b7033c3e67558 and ran git diff --check.
• Checked GitHub code, Issue, and PR search for an existing APISIX entry; none was found on 2026-08-11.
• Ran the Redis make all build successfully with Hugo v0.143.0 extended.
• Confirmed that the rendered page contains the expected Apache APISIX link and that the link returns HTTP 200.

Author: Yilia Lin, Apache APISIX Committer

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Note

Low Risk
Documentation-only list and link update with no product or code impact.

Overview
Adds Apache APISIX to the Redis rate-limiter Ecosystem section under API gateways, with a link to the official limit-count plugin docs (Redis / Redis Cluster shared quotas).

The gateways bullet is lightly reformatted so APISIX is listed first, alongside existing Kong and Envoy entries; no behavior, examples, or recommendations change.

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[CLAassistant]

All committers have signed the CLA.

[andy-stark-redis]

LGTM - thanks for the contribution @Yilialinn !