[guide] Clarify wording

Author: kevinweber

README.md

@@ -2764,7 +2764,7 @@ Other Style Guides
     ```
 
   <a name="whitespace--computed-property-spacing"></a>
-  - [19.15](#whitespace--computed-property-spacing) Enforce spacing inside of computed properties. eslint: [`computed-property-spacing`](https://eslint.org/docs/rules/computed-property-spacing)
+  - [19.15](#whitespace--computed-property-spacing) Enforce spacing inside of computed property brackets. eslint: [`computed-property-spacing`](https://eslint.org/docs/rules/computed-property-spacing)
 
     ```javascript
     // bad