fix(em): fix small typo (#4598)

Author: bene2k1

pages/elastic-metal/troubleshooting/index.mdx

@@ -19,7 +19,7 @@ categories:
 ## Featured Pages
 
 <Grid>
-    <DefaultCards
+    <DefaultCard
       title="Elastic Metal FAQ"
       description="General info on Elastic Metal servers."
       url="/faq/elastic-metal/"