zh-CN: Proofreading and update plan for the JavaScript WeakSet and WeakMap section

[JasonLamv-t]

I plan to proofread and update the translation of the Javascript WeakSet and WeakMap sections. Anyone is welcome to contribute. If you find any issues with the Simplified Chinese WeakSet and WeakMap sections or have already submitted a PR, please mention me so that I can add your work to the progress list below:

WeakMap

• overview, in [zh-cn]: update the translation of WeakMap overview #16772.
• constructor, in [zh-cn]: update the translation of WeakMap constructor #16783.
• delete, in [zh-cn]: update the translation of WeakMap.set()&get()&has()&delete() #16792.
• get, in [zh-cn]: update the translation of WeakMap.set()&get()&has()&delete() #16792.
• has, in [zh-cn]: update the translation of WeakMap.set()&get()&has()&delete() #16792.
• set, in [zh-cn]: update the translation of WeakMap.set()&get()&has()&delete() #16792.

WeakSet

• overview, in [zh-cn]: update the translation of WeakSet overview #16803.
• constructor, in [zh-cn]: add the translation of WeakSet constructor #16827.
• add, in [zh-cn]: update the translation of WeakSet add()&delete()&has() #16842.
• delete, in [zh-cn]: update the translation of WeakSet add()&delete()&has() #16842.
• has, in [zh-cn]: update the translation of WeakSet add()&delete()&has() #16842.

[JasonLamv-t]

All tasks have been completed.