docs(zh): fix code demo (#6237)

yyzclyang · web-flow · commit 382592a58393 · 2021-01-25T21:05:28.000+08:00
diff --git a/docs/zh/dev-guide/plugin-dev.md b/docs/zh/dev-guide/plugin-dev.md
@@ -347,7 +347,7 @@ api.registerCommand(
     description: 'Write a greeting to the console',
     usage: 'vue-cli-service greet'
   },
-  () = > {
+  () => {
     console.log(`👋  Hello`)
   }
 )

Original file line number	Diff line number	Diff line change
`@@ -347,7 +347,7 @@ api.registerCommand(`
`347`	`347`	`description: 'Write a greeting to the console',`
`348`	`348`	`usage: 'vue-cli-service greet'`
`349`	`349`	`},`
`350`		`- () = > {`
	`350`	`+ () => {`
`351`	`351`	console.log(`👋 Hello`)
`352`	`352`	`}`
`353`	`353`	`)`