[example] fix coin.balance -> coin.value (#981)

WGB5445 · web-flow · commit 8cdd03b712ae · 2025-06-13T17:10:08.000Z
diff --git a/apps/nextra/pages/en/build/smart-contracts/book/structs-and-resources.mdx b/apps/nextra/pages/en/build/smart-contracts/book/structs-and-resources.mdx
@@ -531,7 +531,7 @@ module 0x2::m {
   }
 
   public fun withdraw(coin: &mut Coin, amount: u64): Coin {
-    assert!(coin.balance >= amount, 1000);
+    assert!(coin.value >= amount, 1000);
     coin.value = coin.value - amount;
     Coin { value: amount }
   }

Original file line number	Diff line number	Diff line change
`@@ -531,7 +531,7 @@ module 0x2::m {`
`531`	`531`	`}`
`532`	`532`
`533`	`533`	`public fun withdraw(coin: &mut Coin, amount: u64): Coin {`
`534`		`- assert!(coin.balance >= amount, 1000);`
	`534`	`+ assert!(coin.value >= amount, 1000);`
`535`	`535`	`coin.value = coin.value - amount;`
`536`	`536`	`Coin { value: amount }`
`537`	`537`	`}`