Merge pull request #75 from joshdales/readme-update

Update Readme documentation

Author: joshdales

README.md

@@ -90,13 +90,14 @@ Each has numbered `accent` properties and sets the `accent-color` property as we
 	--accent-6: var(--colour-6);
 	--accent-7: var(--colour-7);
 	--accent-8: var(--colour-8);
+	--accent-9: var(--colour-9);
 }
 ```
 The accent variables are often used in the following way on interactive elements:
-1. `accent-3` The standard accent colour.
-2. `accent-2` The accent used when elements are being viewed (either by focus or hover).
-3. `accent-4` The element is being activated or interactive with.
-4. `accent-8` Contrast colour with the main accent.
+1. `accent-4` The standard accent colour for the element.
+2. `accent-3` The accent used when elements are being viewed (either by focus or hover).
+3. `accent-2` The element is being activated or interactive with.
+4. `accent-8` Contrast colour with the main accent, usually text or background.
 
 If you have a button or input and there is no accent class currently set on the element or a common ancestor then they will fallback to using the neutral colours as their accent.