Update demo typography config

Author: ethanshar

demo/src/configurations.js

@@ -22,7 +22,7 @@ Assets.loadAssetsGroup('svgs.demo', {
 Typography.loadTypographies({
   h1: {...Typography.text40},
   h2: {...Typography.text50},
-  h3: {...Typography.text60},
+  h3: {...Typography.text70M},
   body: Typography.text70,
   bodySmall: Typography.text80
 });