Fix justify-self-center example label (#2203)

Fixes #2200

Author: wongjn

src/docs/justify-self.mdx

@@ -98,7 +98,7 @@ Use the `justify-self-center` or `justify-self-center-safe` utilities to align a
   {
     <div className="grid grid-cols-1 gap-8">
       <div>
-        <p className="text-center font-mono text-xs font-medium text-gray-500 dark:text-gray-400">justify-center-end</p>
+        <p className="text-center font-mono text-xs font-medium text-gray-500 dark:text-gray-400">justify-self-center</p>
         <div className="mt-4 grid auto-rows-fr grid-cols-3 justify-items-stretch gap-10 text-center font-mono text-sm leading-6 font-bold text-white">
           <div className="rounded-lg bg-indigo-300 p-4 dark:bg-indigo-800 dark:text-indigo-500">01</div>
           <div className="grid grid-cols-1">