message: [Docs] Update "Relationship filtering" section in querying docs
  The header I think should be an H3, otherwise it doesn't show up in the navigation and gets lost.
  In my testing, it looks like the correct key is `records` in the relationship filter object... it's inconsistent between the two examples.
diff: @@ -271,7 +271,7 @@ For attribute filtering, the following comparison operators are available.
  - `gte`: alias for the `>=` operator.
  - `lte`: alias for the `<=` operator.
  -#### Relationship filtering
  +### Relationship filtering
  Relationship filtering has two types:
  @@ -280,7 +280,7 @@ Filtering on a `hasOne` relationship:
  ```typescript
  const moonsOfJupiter = orbit.cache.query((q) => {
  return q.findRecords('moon')
  - .filter({ relationship: 'planet', op: 'equal', record: { type: 'planet', id: 'jupiter' } })
  + .filter({ relationship: 'planet', op: 'equal', records: { type: 'planet', id: 'jupiter' } })
  })
  ```
  