chore(oas): fixed oas for product category endpoints and model

[shahednasser]

• Fixed some inconsistencies in the OAS comments of product category endpoints and model.
• Removed JS Client snippets since it's still not implemented in the JS Client.

Closes DOCS-451

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Latest commit: cc56a27

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[patrick-medusajs]

LGTM 🤸

[riqwan]

LGTM, thanks!