Updating the code example in FunctionTemplate class documentation

Currently the code example in the FunctionTemplate class documentation
is out of date. This commit updates the examples so they compile and run
without error.

BUG=

Review-Url: https://codereview.chromium.org/2127523003
Cr-Commit-Position: refs/heads/master@{#37741}

AUTHORS

@@ -51,6 +51,7 @@ Craig Schlenter <craig.schlenter@gmail.com>
 Chris Nardi <hichris123@gmail.com>
 Christopher A. Taylor <chris@gameclosure.com>
 Daniel Andersson <kodandersson@gmail.com>
+Daniel Bevenius <daniel.bevenius@gmail.com>
 Daniel James <dnljms@gmail.com>
 Deon Dior <diaoyuanjie@gmail.com>
 Douglas Crosher <dtc-v8@scieneer.com>

include/v8.h

@@ -4418,17 +4418,21 @@ typedef bool (*AccessCheckCallback)(Local<Context> accessing_context,
  * The following example shows how to use a FunctionTemplate:
  *
  * \code
- *    v8::Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New();
- *    t->Set("func_property", v8::Number::New(1));
+ *    v8::Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New(isolate);
+ *    t->Set(isolate, "func_property", v8::Number::New(isolate, 1));
  *
  *    v8::Local<v8::Template> proto_t = t->PrototypeTemplate();
- *    proto_t->Set("proto_method", v8::FunctionTemplate::New(InvokeCallback));
- *    proto_t->Set("proto_const", v8::Number::New(2));
+ *    proto_t->Set(isolate,
+ *                 "proto_method",
+ *                 v8::FunctionTemplate::New(isolate, InvokeCallback));
+ *    proto_t->Set(isolate, "proto_const", v8::Number::New(isolate, 2));
  *
  *    v8::Local<v8::ObjectTemplate> instance_t = t->InstanceTemplate();
- *    instance_t->SetAccessor("instance_accessor", InstanceAccessorCallback);
- *    instance_t->SetNamedPropertyHandler(PropertyHandlerCallback, ...);
- *    instance_t->Set("instance_property", Number::New(3));
+ *    instance_t->SetAccessor(String::NewFromUtf8(isolate, "instance_accessor"),
+ *                            InstanceAccessorCallback);
+ *    instance_t->SetNamedPropertyHandler(PropertyHandlerCallback);
+ *    instance_t->Set(String::NewFromUtf8(isolate, "instance_property"),
+ *                    Number::New(isolate, 3));
  *
  *    v8::Local<v8::Function> function = t->GetFunction();
  *    v8::Local<v8::Object> instance = function->NewInstance();