docs/es6: Changed "ES6" to "ECMAScript 2015 (ES6)"

And updated some formatting of the content.

Author: fhemberger

locale/en/docs/es6.md

@@ -1,79 +1,55 @@
 ---
-title: ES6
+title: ECMAScript 2015 (ES6)
 layout: docs.hbs
 ---
-# ES6 in Node.js
+# ECMAScript 2015 (ES6) in Node.js
 
 Node.js is built against modern versions of [V8](https://developers.google.com/v8/). By keeping up-to-date with the latest releases of this engine, we ensure new features from the [JavaScript ECMA-262 specification](http://www.ecma-international.org/publications/standards/Ecma-262.htm) are brought to Node.js developers in a timely manner, as well as continued performance and stability improvements.
 
-All ES6 features are split into three groups for **shipping**, **staged**, and **in progress** features:
+All ECMAScript 2015 (ES6) features are split into three groups for **shipping**, **staged**, and **in progress** features:
 
 * All **shipping** features, which V8 considers stable, are turned **on by default on Node.js** and do **NOT** require any kind of runtime flag.
 * **Staged** features, which are almost-completed features that are not considered stable by the V8 team, require a runtime flag: `--es_staging` (or its synonym, `--harmony`).
 * **In progress** features can be activated individually by their respective harmony flag (e.g. `--harmony_destructuring`), although this is highly discouraged unless for testing purposes.
 
-## Which ES6 features ship with Node.js by default (no runtime flag required)?
-
+## Which features ship with Node.js by default (no runtime flag required)?
 
 * Block scoping
-
     * [let](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let) (strict mode only)
-
     * [const](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const)
-
-    * `function`-in-blocks (strict mode only)
-
-    >As of v8 3.31.74.1, block-scoped declarations are [intentionally implemented with a non-compliant limitation to strict mode code](https://groups.google.com/forum/#!topic/v8-users/3UXNCkAU8Es). Developers should be aware that this will change as v8 continues towards ES6 specification compliance.
-
+    * `function`-in-blocks (strict mode only [[1]](#ref-1)<span id="backref-1"></span>)
 * [Classes](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes) (strict mode only)
-
 * Collections
-
     * [Map](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map)
-
     * [WeakMap](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakMap)
-
     * [Set](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Set)
-
     * [WeakSet](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet)
-
 * [Typed arrays](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays)
-
 * [Generators](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/function*)
-
 * [Binary and Octal literals](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar#Numeric_literals)
-
 * [Object literal extensions](https://github.com/lukehoban/es6features#enhanced-object-literals) (shorthand properties and methods)
-
 * [Promises](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)
-
 * [New String methods](https://developer.mozilla.org/en-US/docs/Web/JavaScript/New_in_JavaScript/ECMAScript_6_support_in_Mozilla#Additions_to_the_String_object)
-
 * [Symbols](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol)
-
 * [Template strings](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/template_strings)
-
 * [Arrow Functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions)
-
 * [new.target](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/new.target)
-
 * [Object.assign](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
-
 * [Spread operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_operator)
 
 You can view a more detailed list, including a comparison with other engines, on the [compat-table](https://kangax.github.io/compat-table/es6/) project page.
 
-## Which ES6 features are behind the --es_staging flag?
+<small id="ref-1">[[1](#backref-1)]: As of v8 3.31.74.1, block-scoped declarations are [intentionally implemented with a non-compliant limitation to strict mode code](https://groups.google.com/forum/#!topic/v8-users/3UXNCkAU8Es). Developers should be aware that this will change as v8 continues towards ES6 specification compliance.</small>
 
-* [`Symbol.toStringTag`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol) (user-definable results for `Object.prototype.toString`, behind flag `--harmony_tostring`)
+## Which features are behind the --es_staging flag?
 
+* [`Symbol.toStringTag`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol) (user-definable results for `Object.prototype.toString`, behind flag `--harmony_tostring`)
 * [`Array.prototype.includes`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/includes) (determine whether
 an array includes a certain element, behind flag `--harmony_array_includes`)
-
 * [Rest Parameters](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/rest_parameters) (represent an indefinite number
 of arguments as an array, behind flag `--harmony_rest_parameters`)
 
-## Which ES6 features are in progress?
+## Which features are in progress?
 
 New features are constantly being added to the V8 engine. Generally speaking, expect them to land on a future Node.js release, although timing is unknown.