Rename instance()->instantiate() when it's a verb

modules/gdscript/gdscript_cache.cpp

@@ -134,7 +134,7 @@ Ref<GDScriptParserRef> GDScriptCache::get_parser(const String &p_path, GDScriptP
 			return ref;
 		}
 		GDScriptParser *parser = memnew(GDScriptParser);
-		ref.instance();
+		ref.instantiate();
 		ref->parser = parser;
 		ref->path = p_path;
 		singleton->parser_map[p_path] = ref.ptr();
@@ -180,7 +180,7 @@ Ref<GDScript> GDScriptCache::get_shallow_script(const String &p_path, const Stri
 	}
 
 	Ref<GDScript> script;
-	script.instance();
+	script.instantiate();
 	script->set_path(p_path, true);
 	script->set_script_path(p_path);
 	script->load_source_code(p_path);