corrected path to GodotClass in docs

Author: StatisMike

godot-core/src/engine/gfile.rs

@@ -748,7 +748,7 @@ impl BufRead for GFile {
 /// reference will be in possession of only one different object instance or
 /// function in their lifetime.
 ///
-/// Only applicable to [`GodotClass`](godot::obj::GodotClass) objects that
+/// Only applicable to [`GodotClass`](godot_core::obj::GodotClass) objects that
 /// inherits from [`RefCounted`]. To check the uniqueness, call the `check()`
 /// associated method.
 ///