Add missing parenthesis to link. (#1761)

* Add missing parenthesis to link.

Author: rlazo

firebase-config/src/main/java/com/google/firebase/remoteconfig/FirebaseRemoteConfig.java

@@ -69,7 +69,7 @@ public class FirebaseRemoteConfig {
    * <p>Note: Also initializes the Firebase installations SDK that creates installation IDs to
    * identify Firebase installations and periodically sends data to Firebase servers. Remote Config
    * requires installation IDs for Fetch requests. To stop the periodic sync, call {@link
-   * com.google.firebase.installations.FirebaseInstallations#delete}. Sending a Fetch request after
+   * com.google.firebase.installations.FirebaseInstallations#delete()}. Sending a Fetch request after
    * deletion will create a new installation ID for this Firebase installation and resume the
    * periodic sync.
    *
@@ -308,7 +308,7 @@ public Task<Boolean> activate() {
    * <p>Note: Also initializes the Firebase installations SDK that creates installation IDs to
    * identify Firebase installations and periodically sends data to Firebase servers. Remote Config
    * requires installation IDs for Fetch requests. To stop the periodic sync, call {@link
-   * com.google.firebase.installations.FirebaseInstallations#delete}. Sending a Fetch request after
+   * com.google.firebase.installations.FirebaseInstallations#delete()}. Sending a Fetch request after
    * deletion will create a new installation ID for this Firebase installation and resume the
    * periodic sync.
    *
@@ -333,7 +333,7 @@ public Task<Void> fetch() {
    * <p>Note: Also initializes the Firebase installations SDK that creates installation IDs to
    * identify Firebase installations and periodically sends data to Firebase servers. Remote Config
    * requires installation IDs for Fetch requests. To stop the periodic sync, call {@link
-   * com.google.firebase.installations.FirebaseInstallations#delete}. Sending a Fetch request after
+   * com.google.firebase.installations.FirebaseInstallations#delete()}. Sending a Fetch request after
    * deletion will create a new installation ID for this Firebase installation and resume the
    * periodic sync.
    *