Fixing typo.

Author: egilmorez

packages/firestore/lite/index.ts

@@ -4,7 +4,7 @@
  * @remarks This package includes the same feature set as Firestore, but
  * without latency compensation or snapshot listeners (and with
  * correspondingly lighter size footprint). Firestore Lite supports fast
- * write and read, operations but only when online.
+ * write and read operations, but only when online.
  * @packageDocumentation
  */