Fix sub resource ID formatting in Object Class (#5175)

Co-authored-by: Hugo Locurcio <[email protected]>

development/cpp/object_class.rst

@@ -309,7 +309,7 @@ Saving a resource can be done with the resource saver API:
 Instance will be saved. Sub resources that have a path to a file will be
 saved as a reference to that resource. Sub resources without a path will
 be bundled with the saved resource and assigned sub-IDs, like
-"res://someresource.res::1". This also helps to cache them when loaded.
+``res://someresource.res::1``. This also helps to cache them when loaded.
 
 References:
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