Tweaked text to reflect ligatures being enabled by default in Atom 1.9

Atom-instructions.md

@@ -4,24 +4,25 @@ To change your font to Fira Code, open Atom's settings (`cmd+,`), make sure the
 
 ## Ligatures
 
-To enable ligatures, `Menu → Stylesheet...`
+Ligatures are enabled by default in Atom 1.9 and above.
+
+To enable ligatures on older Atom versions (Atom 1.1 and newer), go to `Menu → Stylesheet...`
 
 ![](https://i.imgur.com/sulSOtK.png)
 
 and add `text-rendering` to `atom-text-editor`:
-```
+
+```css
 atom-text-editor {
   text-rendering: optimizeLegibility;
 }
 ```
 
-You’ll need Atom 1.1 or newer.
-
 Beware that in some syntaxes **selected ligatures might not work**. This is usually a syntax parser/tokenization issue (e.g. `->` breaks into two symbols by JS/Ruby syntax highlighter). See issues [#63](https://github.com/tonsky/FiraCode/issues/63) and [#69](https://github.com/tonsky/FiraCode/issues/69)
 
 To turn off ligatures inside of strings and regular expressions you can add this to your stylesheet:
 
-```
+```css
 atom-text-editor::shadow .string.quoted,
 atom-text-editor::shadow .string.regexp {
   -webkit-font-feature-settings: "liga" off, "calt" off;