Fix a typo and make a clarification in ES6 style guide

docs/es6_chromium.md

 <!-- Feature template markdown:
 ## Header
 
 **Usage Example:**
 
 ```js
 
 ```
 
 **Documentation:** [link]()
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   document.querySelectorAll('hr').forEach(function(el) {
     el.parentNode.removeChild(el);
   });
 });
 </script>
 
 [TOC]
 
 # ES6 Support In Chromium
 
-This is a list of new/updated features in ES6 specs that is being considered to
-be supported for Chromium development.
+This is a list of [ECMAScript6](https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/ECMAScript_6_support_in_Mozilla)
+features allowed in Chromium code.
 
-> **TBD:** Do we want to differenciate allow/ban status between subprojects? If
-> so, how to denote?
+This is **not** a status list of [v8](https://developers.google.com/v8/)'s
+support for language features.
 
-> **TBD:** Cross platform-build support?
+> **TBD:** Do we need to differentiate per-project?
+
+> **TBD:** Cross-platform build support? As in: transpilers?
 
 You can propose changing the status of a feature by sending an email to
 chromium-dev@chromium.org. Include a short blurb on what the feature is and why
 you think it should or should not be allowed, along with links to any relevant
 previous discussion. If the list arrives at some consensus, send a codereview
 to change this file accordingly, linking to your discussion thread.
 
 > Some descriptions and Usage examples are from [kangax](https://kangax.github.io/compat-table/es6/)
 and [http://es6-features.org/](http://es6-features.org/)
 
@@ skipping 836 matching lines @@
 
 ```js
 // See Doc
 ```
 
 **Documentation:** [link](http://www.ecma-international.org/ecma-262/6.0/#sec-math)
 
 **Discussion Notes / Link to Thread:**
 
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