Update Babel plugin tests (#20053)

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

@@ -1,17 +1,5 @@
-// https://babeljs.io/docs/babel-plugin-proposal-function-bind
+/*
+`functionBind` ([proposal](https://github.com/zenparsing/es-function-bind))
+*/
 
-obj::func
-// is equivalent to:
-func.bind(obj)
-
-::obj.func
-// is equivalent to:
-obj.func.bind(obj)
-
-obj::func(val)
-// is equivalent to:
-func.call(obj, val)
-
-::obj.func(val)
-// is equivalent to:
-obj.func.call(obj, val)
+a::b