docs: correct location of initialColorModeName: 'light' (#1922)

Author: gleich

packages/docs/src/pages/color-modes.mdx

@@ -15,7 +15,9 @@ for optional color modes.
 ```js
 // example theme colors
 {
-  initialColorModeName: 'light',
+  config: {
+    initialColorModeName: 'light',
+  }
   colors: {
     text: '#000',
     background: '#fff',
@@ -52,7 +54,9 @@ be accessible as
 
 ```js
 {
-  initialColorModeName: 'light',
+  config: {
+    initialColorModeName: 'light',
+  }
   rawColors: {
     primary: '#07c',
     modes: {