docs(advanced): fix invalid syntax in knowledge base example

[Memtensor-AI]

问题

content/en/memos_cloud/features/advanced/knowledge_base.md 中的命令执行失败：

• # Retrieve memories related to "intranet proxy" and "won't open" based on the employee's question, automatically identify the employee's device model. → invalid syntax

Root Cause

syntax_error_in_doc - 代码示例中存在语法错误，导致 Python 解析失败。

修复内容

• 将 content/en/memos_cloud/features/advanced/knowledge_base.md 中的相关代码示例进行修正，确保语法正确。具体来说，去掉了不必要的换行符，确保代码块的完整性。

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这是 Doc Agent 自动起草的 draft PR，模式：source_patch。请 review 每个文件 diff，确认无误后再合并。
如有 patch 应用失败的文件，会在底部以「未应用 patches」附建议供人工处理。

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Doc Agent patches

已自动应用 (1)

• content/en/memos_cloud/features/advanced/knowledge_base.md (line_replace)

[Memtensor-AI]

Doc Agent 文档同步提醒 @Memtensor-AI

The documentation for the knowledge base example has been updated to fix syntax errors, but ensure that the changes are reflected in all relevant documentation.

[warning] Syntax error in knowledge base example

• 影响：The PR modifies the code example in content/en/memos_cloud/features/advanced/knowledge_base.md to fix a syntax error. However, the documentation may still need to be checked for consistency with the updated example, especially in related sections or translations.
• 建议：Please verify that all related documentation reflects the changes made in this PR.
• 相关文档：content/en/memos_cloud/features/advanced/knowledge_base.md

自检测执行结果

未触发命令自检测：PR 处于 draft 状态，不触发命令自检测

当前为软提醒，不阻塞合并。若确认无需改文档，请在 PR 中说明原因。
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