docs(zh): improve explicit memory type model translation

[sivaadithya25]

Fixes #140

Summary

Improved the Chinese translation of the explicit memory type model documentation.

Changes

• Corrected section headings to better match the English source.
• Standardized terminology such as 解引用, 生命周期, and 指针.
• Improved readability and naturalness of the Chinese text.
• Preserved all code examples, outputs, comments, and document structure.

Validation

• Verified no Wave code blocks were modified.
• Verified Markdown comments and structure remain unchanged.
• Ran translation consistency checks.
• Passed git diff --check.

[Copilot]

Copilot review overview

🟢 Approval recommended

The remaining nit is minor and does not block approval.

Review effort: Lite
Findings: None

What changed in this PR

Improves the Chinese translation of the explicit memory type model documentation.

Changes:

• Refines headings and terminology.
• Improves clarity and readability.
• Preserves examples and document structure.

File	Summary
wavedoc/​zh/​language/​explicit-memory-type-model.md	Updated Chinese translation; one minor nit remains about explicitly naming the caller.

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[sivaadithya25]

Hi @LunaStev ,

Just following up on this PR. All checks are passing and the requested documentation updates have been completed.

Please let me know if any further changes are needed. Thank you for your time and review.

[LunaStev]

LGTM