Add category to Ads Events and expandable response examples

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Changes

This PR makes two improvements to the data schema documentation:

1. Added missing category field to Ads Events table

The category field was documented in Search, Browsing, YouTube, and Receipts events but was missing from Ads Events. According to the live Query API OpenAPI spec, Ads events include a category field in responses (confirmed at line 3285 in the OpenAPI schema).

Added row:

| `category` | The topic category this ad relates to | "/Shopping/Apparel/Footwear" |

2. Added expandable response examples for all event types

Each event type now includes a collapsible response example that users can expand to see a complete API response. This keeps the page clean and scannable by default while providing detailed examples when needed.

Implementation:

• Used Mintlify <Accordion> component for each event type
• Examples show the full sync response envelope with realistic data
• Matches the live API response format from the OpenAPI specification

Event types updated:

• ✅ Search Events
• ✅ Browsing Events
• ✅ YouTube Events
• ✅ Ads Events (+ added missing category field)
• ✅ Receipts Events

Verification

All response examples verified against the live Query API OpenAPI schema fetched from https://query.emergedata.ai/openapi.json

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Updated for commit e7b52a3