[I] [Doc] Remove malformed Markdown from the Chinese best-practice guide [rocketmq]

["NUAAwqy (via GitHub)" <gi...@apache.org>]

NUAAwqy opened a new issue, #11226:
URL: https://github.com/apache/rocketmq/issues/11226

   ### Problem
   
   The end of `docs/cn/best_practice.md` contains malformed Markdown (`[]([]())`) that renders as meaningless content. The preceding `vm.max_map_count` bullet also contains an internal proofreading note (`agressiveness --> aggressiveness`) and the phrase `建议将为此参数设置较大的值`, which is grammatically incorrect.
   
   ### Expected behavior
   
   The Chinese best-practice guide should render without stray Markdown or editorial notes, and the `vm.max_map_count` recommendation should read naturally.
   
   ### Scope
   
   - Remove the malformed empty link.
   - Remove the proofreading artifact and correct the sentence.
   - No runtime code changes.


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