Correct typo in comment [nocode]

lib/serialize/blocks.js

@@ -732,7 +732,7 @@ module.exports = {
 		// A better solution when outputting sloppy mode code would be to just use a var called `arguments`,
 		// rather than injecting. Of course this isn't possible in ESM.
 		// TODO: Ensure scope function using `this` is strict mode if value of `this` is not an object.
-		// In sloppy mode literals passed as `this` gets boxed.
+		// In sloppy mode, literals passed as `this` get boxed.
 		// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode#securing_javascript
 		// TODO: Also doesn't work where `this` or `arguments` is circular and is injected late.
 		if (frozenThisVarName) {