Fix shader editor documentation link

editor/plugins/shader_editor_plugin.cpp

@@ -339,7 +339,7 @@ void ShaderEditor::_menu_option(int p_option) {
 			shader_editor->remove_all_bookmarks();
 		} break;
 		case HELP_DOCS: {
-			OS::get_singleton()->shell_open("https://docs.godotengine.org/en/stable/tutorials/shading/shading_reference/index.html");
+			OS::get_singleton()->shell_open("https://docs.godotengine.org/en/latest/tutorials/shaders/shader_reference/index.html");
 		} break;
 	}
 	if (p_option != SEARCH_FIND && p_option != SEARCH_REPLACE && p_option != SEARCH_GOTO_LINE) {