fix typos + formatting

Author: Brian Chen

packages/firebase/index.d.ts

@@ -6064,11 +6064,11 @@ declare namespace firebase.firestore {
     /**
      * Clears the persistent storage.
      *
-     * Must be called while the client is not started (after the app is shutdown
-     * or when the app is first initialized). On startup, this method must called
-     * before other methods (other than settings()). If the client is still
-     * running, an exception with the a code of `failed-precondition` will be
-     * thrown.
+     * Must be called while the client is not started (after the app is
+     * shutdown or when the app is first initialized). On startup, this method
+     * must be called before other methods (other than settings()). If the
+     * client is still running, an exception with a code of `failed-precondition`
+     * will be thrown.
      *
      * @return A promise that is resolved once the persistent storage has been
      * cleared. Otherwise, the promise is rejected with an error.

packages/firestore-types/index.d.ts

@@ -218,17 +218,17 @@ export class FirebaseFirestore {
   app: any;
 
   /**
-   * Clears the persistent storage.
-   *
-   * Must be called while the client is not started (after the app is shutdown
-   * or when the app is first initialized). On startup, this method must called
-   * before other methods (other than settings()). If the client is still
-   * running, an exception with the a code of `failed-precondition` will be
-   * thrown.
-   *
-   * @return A promise that is resolved once the persistent storage has been
-   * cleared. Otherwise, the promise rejects with an error.
-   */
+     * Clears the persistent storage.
+     *
+     * Must be called while the client is not started (after the app is
+     * shutdown or when the app is first initialized). On startup, this method
+     * must be called before other methods (other than settings()). If the
+     * client is still running, an exception with a code of `failed-precondition`
+     * will be thrown.
+     *
+     * @return A promise that is resolved once the persistent storage has been
+     * cleared. Otherwise, the promise is rejected with an error.
+     */
   clearPersistence(): Promise<void>;
 
   /**