Add in missing migration info (#762)

Author: amcolash

docs/migration/1XX-to-2XX.md

@@ -54,7 +54,8 @@ Several authentication methods have been renamed and / or have different method
 | `$resetPassword(credentials)` | `$sendPasswordResetEmail(email)` | |
 | `$unauth()` | `$signOut()` | |
 | `$onAuth(callback)` | `$onAuthStateChanged(callback)` | |
-
+| `$requireAuth()` | `$requireSignIn()` | |
+| `$waitForAuth()` | `$waitForSignIn()` | |
 
 ## Auth Payload Format Changes