Fix syntax errors in JavaScript examples.

index.bs

@@ -3343,7 +3343,7 @@ The sample code for generating and registering a new key follows:
 
       // User:
       user: {
-        id: "1098237235409872"
+        id: "1098237235409872",
         name: "john.p.smith@example.com",
         displayName: "John P. Smith",
         icon: "https://pics.acme.com/00/p/aBjjjpqPb.png"
@@ -3497,9 +3497,9 @@ extension for transaction authorization.
     var options = {
                     challenge: encoder.encode("climb a mountain"),
                     timeout: 60000,  // 1 minute
-                    allowCredentials: [acceptableCredential1, acceptableCredential2];
+                    allowCredentials: [acceptableCredential1, acceptableCredential2],
                     extensions: { 'webauthn.txauth.simple':
-                       "Wave your hands in the air like you just don't care" };
+                       "Wave your hands in the air like you just don't care" }
                   };
 
     navigator.credentials.get({ "publicKey": options })