fix: update placeholders in strings.xml

Author: demolaf

app/src/main/res/values/strings.xml

@@ -1,10 +1,10 @@
 <resources>
     <string name="app_name">FirebaseUI Demo</string>
 
-    <string name="firebase_web_host" translatable="false">temp-test-aa342.firebaseapp.com</string>
+    <string name="firebase_web_host" translatable="false">CHANGE-HERE</string>
 
     <!-- Facebook SDK Configuration -->
-    <string name="facebook_application_id" translatable="false">879782018043124</string>
-    <string name="facebook_login_protocol_scheme" translatable="false">fb879782018043124</string>
-    <string name="facebook_client_token" translatable="false">3f03c9e0b3b4e084636d7bebd5f3633a</string>
+    <string name="facebook_application_id" translatable="false">APP-ID</string>
+    <string name="facebook_login_protocol_scheme" translatable="false">fbAPP-ID</string>
+    <string name="facebook_client_token" translatable="false">CHANGE-HERE</string>
 </resources>