update(shared subscription): Add dispatch strategy

[Meggielqk]

No description provided.

[Copilot]

Pull Request Overview

This PR adds comprehensive documentation about EMQX's shared subscription dispatch strategies. The update provides users with detailed guidance on configuring how messages are distributed among subscribers within shared subscription groups, enabling optimization for different workloads and cluster topologies.

• Adds a new section explaining shared subscription dispatch strategies (random, round_robin, round_robin_per_group, sticky, local, hash_topic, hash_clientid)
• Documents the "Initial Sticky Pick" configuration option for the sticky strategy
• Provides step-by-step instructions for configuring these strategies via the EMQX Dashboard
• Includes a minor grammar improvement (adding a comma in the English version)

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
en_US/messaging/mqtt-shared-subscription.md	Adds shared subscription strategy documentation and corrects grammar with comma addition
zh_CN/messaging/mqtt-shared-subscription.md	Adds Chinese translation of shared subscription strategy documentation

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[zmstone]

please align the docs with https://docs.emqx.com/en/enterprise/v6.0.1/hocon/#V-mqtt-S-mqtt-shared_subscription_strategy