Fix various typos

Found via `codespell`

modules/visual_script/visual_script_expression.cpp

@@ -1141,7 +1141,7 @@ VisualScriptExpression::ENode *VisualScriptExpression::_parse_expression() {
 				}
 			}
 
-			//consecutively do unary opeators
+			//consecutively do unary operators
 			for (int i = expr_pos - 1; i >= next_op; i--) {
 
 				OperatorNode *op = alloc_node<OperatorNode>();