Update categories REST API docs

[meker12]

Purpose

• Add metaTags and images fields to the FeedCategory and FeedCategoryUpdate schemas in the Data Ingestion REST API, enabling SEO metadata and image associations for categories

• Update create and update category operation descriptions and request examples to document the new optional fields

Documentation updates

• Categories tag description — Added bullet points for SEO meta tags and category images
• Create categories operation — Added guidance for metaTags and images fields; updated example to include both fields on the "men" category
• Update categories operation — Updated example description and request body to show metaTags and images usage

Test plan

• Verify the OpenAPI spec validates without errors
• Confirm the rendered API reference displays the new metaTags and images fields on FeedCategory and FeedCategoryUpdate schemas
• Verify the create and update category examples render correctly with the new fields
• Check that the ProductMetaAttribute and ProductImage schema refs resolve properly in the docs

whatsnew
Updated the Categories operation in the Data Ingestion REST API reference to include new description, metaTags, and images field. This update enables SEO metadata and image associations for categories for customers using Adobe Commerce Optimizer for catalog management.