DOC-6738 removed mention of Active-active as a source DB

[andy-stark-redis]

Note

Low Risk
Documentation-only wording changes with no product or runtime behavior impact.

Overview
Aligns RDI guidance with DOC-6738 by dropping Active-Active as a called-out source limitation.

The interactive decision tree’s singleSource whyAsk now only warns that multiple sources create conflicting change events—it no longer mentions Active-Active replicas. The When not to use RDI bullet about ingesting from two Active-Active replicas at once is removed from rdi-when-to-use.md and the Redis Cloud RDI overview (operate/rc/rdi/_index.md). Other multi-target guidance still references Active Active only as a Redis replication option, not as an RDI source pattern.

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[github-actions]

DOC-6738

[github-actions]

Staging links:
https://redis.io/docs/staging/DOC-6738-remove-incorrect-active-active-reference-from-rdi-documentation/integrate/redis-data-integration/when-to-use
https://redis.io/docs/staging/DOC-6738-remove-incorrect-active-active-reference-from-rdi-documentation/operate/rc/rdi/

[jit-ci]

🛡️ Jit Security Scan Results

✅ No security findings were detected in this PR

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^{Security scan by Jit}

[dwdougherty]

LGTM.

[andy-stark-redis]

Thanks @dwdougherty !