Fix a typo in a comment.

base/lazy_instance.h

Index: base/lazy_instance.h
diff --git a/base/lazy_instance.h b/base/lazy_instance.h
index 0849503ea35239f09055d0184e4b84d2037ca69a..10c7b31deea51b1c9b06dc200af28f7f5b474ebf 100644
--- a/base/lazy_instance.h
+++ b/base/lazy_instance.h
@@ -24,7 +24,7 @@
 // requires that Type be a complete type so we can determine the size.
 //
 // Example usage:
-//   static LazyInstance<MyClass> my_instance(base::LINKER_INITALIZED);
+//   static LazyInstance<MyClass> my_instance(base::LINKER_INITIALIZED);
 //   void SomeMethod() {
 //     my_instance.Get().SomeMethod();  // MyClass::SomeMethod()
 //