Three documentation inaccuracies, all independent of each other.
1. `media_id`, `image` and `gif_url` were typed `string | null`, but no
record has a null in any of them (0/1324 each) and the JSON Schema
declares all three as required, non-nullable strings — `image` and
`gif_url` even carry path patterns. The optional type pushed needless
null-handling onto every consumer. Narrowed to `string`.
2. `instruction_steps` was missing from the interface entirely, even
though every record carries it and the field table documents it.
Added, typed `string[]` per language.
3. The Python example stopped at Hindi, skipping Polish and Korean; the
JavaScript example right below it lists both. Added the two lines.
Docs only — no data or schema changes.
