wording tweaks

Author: dconeybe

packages/firestore/src/api/snapshot.ts

@@ -53,16 +53,16 @@ import { SnapshotListenOptions } from './reference_impl';
  * for example, have properties with complex, nested data types, properties used
  * for memoization, properties of types not supported by Firestore (such as
  * `symbol` and `bigint`), and helper functions that perform compound
- * operations. Such classes are not suitable or possible to store into a
+ * operations. Such classes are not suitable and/or possible to store into a
  * Firestore database. Instead, instances of such classes need to be converted
- * to "plain old JavaScript objects" (POJOs), objects with only primitive
- * properties, potentially nested inside other objects or arrays. In this
+ * to "plain old JavaScript objects" (POJOs) with exclusively primitive
+ * properties, potentially nested inside other POJOs or arrays of POJOs. In this
  * context, this type is referred to as the "DbModel" and would be an object
  * suitable for persisting into Firestore. For convenience, applications can
  * implement `FirestoreDataConverter` and register the converter with Firestore
- * objects, such a `DocumentReference` or `Query`, to automatically convert
+ * objects, such as `DocumentReference` or `Query`, to automatically convert
  * `AppModel` to `DbModel` when storing into Firestore, and convert `DbModel`
- * back to `AppModel` when retrieving from Firestore.
+ * to `AppModel` when retrieving from Firestore.
  *
  * @example
  *

packages/firestore/src/lite-api/snapshot.ts

@@ -51,16 +51,16 @@ import { AbstractUserDataWriter } from './user_data_writer';
  * for example, have properties with complex, nested data types, properties used
  * for memoization, properties of types not supported by Firestore (such as
  * `symbol` and `bigint`), and helper functions that perform compound
- * operations. Such classes are not suitable or possible to store into a
+ * operations. Such classes are not suitable and/or possible to store into a
  * Firestore database. Instead, instances of such classes need to be converted
- * to "plain old JavaScript objects" (POJOs), objects with only primitive
- * properties, potentially nested inside other objects or arrays. In this
+ * to "plain old JavaScript objects" (POJOs) with exclusively primitive
+ * properties, potentially nested inside other POJOs or arrays of POJOs. In this
  * context, this type is referred to as the "DbModel" and would be an object
  * suitable for persisting into Firestore. For convenience, applications can
  * implement `FirestoreDataConverter` and register the converter with Firestore
- * objects, such a `DocumentReference` or `Query`, to automatically convert
+ * objects, such as `DocumentReference` or `Query`, to automatically convert
  * `AppModel` to `DbModel` when storing into Firestore, and convert `DbModel`
- * back to `AppModel` when retrieving from Firestore.
+ * to `AppModel` when retrieving from Firestore.
  *
  * @example
  *