Remove Good example title from as keyword example

Removed Good example title from the example for the "as" keyword, as it is a neutral example.

Author: Lexyth

tutorials/scripting/gdscript/gdscript_styleguide.rst

@@ -1053,8 +1053,6 @@ should set the type explicitly.
 Alternatively, you can use the ``as`` keyword to cast the return type, and
 that type will be used to infer the type of the var.
 
-**Good**:
-
 .. rst-class:: code-example-good
 
 ::