Also deprecate completed callback

Author: hsubox76

packages/auth/src/core/index.ts

@@ -71,7 +71,7 @@ export function setPersistence(
  * @param error - Deprecated. This callback is never triggered. Errors
  * on signing in/out can be caught in promises returned from
  * sign-in/sign-out functions.
- * @param completed - callback triggered when observer is removed.
+ * @param completed - Deprecated. This callback is never triggered.
  *
  * @public
  */
@@ -118,7 +118,7 @@ export function onIdTokenChanged(
  * @param error - Deprecated. This callback is never triggered. Errors
  * on signing in/out can be caught in promises returned from
  * sign-in/sign-out functions.
- * @param completed - callback triggered when observer is removed.
+ * @param completed - Deprecated. This callback is never triggered.
  *
  * @public
  */

packages/auth/src/model/public_types.ts

@@ -249,7 +249,7 @@ export interface Auth {
    * @param error - Deprecated. This callback is never triggered. Errors
    * on signing in/out can be caught in promises returned from
    * sign-in/sign-out functions.
-   * @param completed - callback triggered when observer is removed.
+   * @param completed - Deprecated. This callback is never triggered.
    */
   onAuthStateChanged(
     nextOrObserver: NextOrObserver<User | null>,
@@ -279,7 +279,7 @@ export interface Auth {
    * @param error - Deprecated. This callback is never triggered. Errors
    * on signing in/out can be caught in promises returned from
    * sign-in/sign-out functions.
-   * @param completed - callback triggered when observer is removed.
+   * @param completed - Deprecated. This callback is never triggered.
    */
   onIdTokenChanged(
     nextOrObserver: NextOrObserver<User | null>,