[config] Add example text

src/pg/_config.pug

@@ -1,7 +1,7 @@
 - var site = "DS2 core"
 - var lang = "en-uk"
 - var colorpfx =  "colour"
-- var headings = ["What is it", "When to use it", "How to use it"]
+- var headings = ["What is it", "When to use it", "How to use it", "Example"]
 - var downloadExtensions = ["js", "pug", "scss"]
 - var generateColourToken = ["colours"]
 

src/scss/_core.scss

@@ -116,7 +116,7 @@
 				display: grid; 
 				gap: .5rem;
 				grid-template-columns: repeat(3, 1fr);
-				grid-template-rows: 2.5rem repeat(2, max-content);
+				grid-template-rows: repeat(3, max-content);
 				.result {
 					align-items: center;
 					border-radius: .5rem;