Show property-level examples next to param descriptions

Properties inside a request schema often carry `example`/`examples` (a sample value for that one field, not a whole request). These are currently dropped, and can't safely be assembled into a full payload — but they're useful inline.

Follow-up: in `mk_doc`, append `(example: value)` after each param description when the property has one.

Coverage scan: Cloudflare has 608 body ops with *only* property-level examples (47%); OpenAI 15; Anthropic 5.

Start at the `mk_doc` entry point and trace how request-schema properties become parameter descriptions. Preserve each property's individual `example` or `examples` value as inline text without assembling a full request payload. Done means generated documentation shows `(example: value)` after descriptions for properties that provide one.

Written by the indexing model from the issue text.