Update Babel plugin tests (#20053)

tests/format/js/babel-plugins/function-sent.js

@@ -1,10 +1,5 @@
-// https://babeljs.io/docs/babel-plugin-proposal-function-sent
+/*
+`functionSent` ([proposal](https://github.com/tc39/proposal-function.sent))
+*/
 
-function* generator() {
-    console.log("Sent", function.sent);
-    console.log("Yield", yield);
-}
-
-const iterator = generator();
-iterator.next(1); // Logs "Sent 1"
-iterator.next(2); // Logs "Yield 2"
+function* g() { function.sent }