docs: Resolve issues with 'relations'

docs: Resolve issues with 'relations'

Two issues here:

- 'PATCH /patches/{id}' and 'PUT /patches/{id}' expect a list of
  integers on the 'related' field - not strings
- 'GET /patches' and 'GET /patches/{id}' return a list of embedded patch
  objects on the 'related' field - not strings

Signed-off-by: Stephen Finucane <stephen@that.guru>