[guide] Add eslint rule to spacing in a function signature topic

[guide] Add eslint rules to spacing in a function signature topic

Author: felipethome

README.md

@@ -743,7 +743,7 @@ Other Style Guides
     ```
 
   <a name="functions--signature-spacing"></a><a name="7.11"></a>
-  - [7.11](#functions--signature-spacing) Spacing in a function signature.
+  - [7.11](#functions--signature-spacing) Spacing in a function signature. eslint: [`space-before-function-paren`](http://eslint.org/docs/rules/space-before-function-paren) [`space-before-blocks`](http://eslint.org/docs/rules/space-before-blocks)
 
     > Why? Consistency is good, and you shouldn’t have to add or remove a space when adding or removing a name.