docs: update theme-ui initialColorMode key (#87)

Yihwan · rakannimer · commit 45f7731796ee · 2019-12-10T10:00:01.000+02:00
diff --git a/src/docs/documentation/customizing/gatsby-theme.mdx b/src/docs/documentation/customizing/gatsby-theme.mdx
@@ -86,7 +86,7 @@ To set the dark version as default, just set your `doczrc.js` like that:
 // doczrc.js
 export default {
   themeConfig: {
-    mode: 'dark',
+    initialColorMode: 'dark',
   },
 }
 ```

Original file line number	Diff line number	Diff line change
@@ -86,7 +86,7 @@ To set the dark version as default, just set your `doczrc.js` like that:
`86`	`86`	`// doczrc.js`
`87`	`87`	`export default {`
`88`	`88`	`themeConfig: {`
`89`		`- mode: 'dark',`
	`89`	`+ initialColorMode: 'dark',`
`90`	`90`	`},`
`91`	`91`	`}`
`92`	`92`	```