fix

Author: kamilkisiela

src/pages/learn/federation.mdx

@@ -67,7 +67,7 @@ The federation process involves several key components:
 
 <Tabs items={['Products subgraph', 'Orders subgraph', 'Users subgraph']}>
 <Tabs.Tab>
-`graphql
+```graphql
     type Product @key(fields: "id") {
       id: ID!
       title: String!