fix broken ref docs urls

Author: thatfiredev

auth-next/index.js

@@ -52,7 +52,7 @@ function authStateListener() {
   onAuthStateChanged(auth, (user) => {
     if (user) {
       // User is signed in, see docs for a list of available properties
-      // https://firebase.google.com/docs/reference/js/firebase.User
+      // https://firebase.google.com/docs/reference/js/v8/firebase.User
       const uid = user.uid;
       // ...
     } else {
@@ -72,7 +72,7 @@ function currentUser() {
 
   if (user) {
     // User is signed in, see docs for a list of available properties
-    // https://firebase.google.com/docs/reference/js/firebase.User
+    // https://firebase.google.com/docs/reference/js/v8/firebase.User
     // ...
   } else {
     // No user is signed in.

auth/index.js

@@ -43,7 +43,7 @@ function authStateListener() {
   firebase.auth().onAuthStateChanged((user) => {
     if (user) {
       // User is signed in, see docs for a list of available properties
-      // https://firebase.google.com/docs/reference/js/firebase.User
+      // https://firebase.google.com/docs/reference/js/v8/firebase.User
       var uid = user.uid;
       // ...
     } else {
@@ -60,7 +60,7 @@ function currentUser() {
 
   if (user) {
     // User is signed in, see docs for a list of available properties
-    // https://firebase.google.com/docs/reference/js/firebase.User
+    // https://firebase.google.com/docs/reference/js/v8/firebase.User
     // ...
   } else {
     // No user is signed in.

firestore/test.firestore.js

@@ -600,7 +600,7 @@ describe("firestore", () => {
             var docRef = db.collection("cities").doc("SF");
 
             // Valid options for source are 'server', 'cache', or
-            // 'default'. See https://firebase.google.com/docs/reference/js/firebase.firestore.GetOptions
+            // 'default'. See https://firebase.google.com/docs/reference/js/v8/firebase.firestore.GetOptions
             // for more information.
             var getOptions = {
                 source: 'cache'

snippets/auth-next/index/auth_current_user.js

@@ -12,7 +12,7 @@ const user = auth.currentUser;
 
 if (user) {
   // User is signed in, see docs for a list of available properties
-  // https://firebase.google.com/docs/reference/js/firebase.User
+  // https://firebase.google.com/docs/reference/js/v8/firebase.User
   // ...
 } else {
   // No user is signed in.

snippets/auth-next/index/auth_state_listener.js

@@ -11,7 +11,7 @@ const auth = getAuth();
 onAuthStateChanged(auth, (user) => {
   if (user) {
     // User is signed in, see docs for a list of available properties
-    // https://firebase.google.com/docs/reference/js/firebase.User
+    // https://firebase.google.com/docs/reference/js/v8/firebase.User
     const uid = user.uid;
     // ...
   } else {