[firestore docs] Question about query name in firestore snippets

Line 590 in cccc005

const allCapitalsRes = citiesRef.where('capital', '==', true);

in simpleQuery function, reference to a collection is named citiesRef (1) and query on this ref is named queryRef (2) - both with ref at the end. Only the result of the query is named res (3)

async function simpleQuery(db) {
  // Create a reference to the cities collection
  const citiesRef = db.collection('cities'); // (1)

  // Create a query against the collection
  const queryRef = citiesRef.where('state', '==', 'CA'); // (2)
  // [END firestore_query_filter_eq_string]

  const res = await queryRef.get(); // (3)
  res.forEach(doc => {
    console.log(doc.id, ' => ', doc.data());
  });
}

however in queryAndFilter function we have a query on a ref that ends with a res in the variable name (1). Shouldn't it be called allCapitalsRef? What is the proper naming convention?

async function queryAndFilter(db) {
  // Create a reference to the cities collection
  const citiesRef = db.collection('cities');

  // Create a query against the collection
  const allCapitalsRes = citiesRef.where('capital', '==', true); // (1)
 // ...rest of the function
}

The code is provided at https://firebase.google.com/docs/firestore/query-data/queries#simple_queries

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