docs(firestore): Typo (#2849)

Typo, intrested => interested

Co-authored-by: James Daniels <jamesdaniels@google.com>

Author: kwhjvdkamp

docs/firestore/collections.md

@@ -260,7 +260,7 @@ export class AppComponent {
 
 ### Limiting events
 
-There are three `DocumentChangeType`s in Firestore: `added`, `removed`, and `modified`. Each streaming method listens to all three by default. However, you may only be intrested in one of these events. You can specify which events you'd like to use through the first parameter of each method:
+There are three `DocumentChangeType`s in Firestore: `added`, `removed`, and `modified`. Each streaming method listens to all three by default. However, you may only be interested in one of these events. You can specify which events you'd like to use through the first parameter of each method:
 
 #### Basic example