fix: Tests comments

Author: seebees

modules/example-browser/src/fallback.ts

@@ -13,8 +13,8 @@
  * limitations under the License.
  */
 
-/* This is a simple example of using a raw AES keyring
- * to encrypt and decrypt using the AWS Encryption SDK for Javascript
+/* This is a simple example of configuring a fallback
+ * for the AWS Encryption SDK for Javascript
  * in a browser.
  */
 
@@ -31,6 +31,12 @@ import { toBase64 } from '@aws-sdk/util-base64-browser'
 
 // @ts-ignore
 import { subtle } from 'msrcrypto'
+/* In this example we use the JavaScript implementation
+ * of WebCrypto from MSRCrypto
+ * and configure it as a fallback for the AWS Encryption SDK.
+ * The implementation will only be used if it is needed.
+ * The AWS Encryption SDK will _always_ prefer the native browser implementation.
+ */
 configureFallback(subtle)
 
 /* This is done to facilitate testing. */