[firestore docs] Question about query name in firestore snippets

https://github.com/firebase/snippets-node/blob/cccc005f6ba6d3895d1b380215bf54c148dce3fa/firestore/main/index.js#L590

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)
```typescript
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?
```typescript
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

Inspect firestore/main/index.js around simpleQuery and queryAndFilter, then compare the linked Firestore query documentation. Determine the naming convention intended for collection references, query objects, and query results; the work is done when the snippet and linked documentation use consistent, agreed naming.

Written by the indexing model from the issue text.