docs: fix RedisCacheStore → RedisStore in example comments

[Siddhesh Kabra (Xsidz)]

Summary

Fixes #7084

RedisCacheStore is not a real class — the correct name is RedisStore (from autogen_ext.cache_store.redis). The wrong name appeared as a comment in three example code blocks.

Files changed:

• python/packages/autogen-ext/src/autogen_ext/models/cache/_chat_completion_cache.py — docstring example
• python/docs/src/user-guide/agentchat-user-guide/migration-guide.md — migration guide example
• python/docs/src/user-guide/core-user-guide/components/model-clients.ipynb — model clients notebook

All three were comments showing Redis as an alternative to DiskCache, so no runtime behavior changes.

Test plan

• grep -rn "RedisCacheStore" returns nothing after the fix
• RedisStore is the actual class in autogen_ext/cache_store/redis.py

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[Siddhesh Kabra (Xsidz)]

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