Update prefer-t-throws.md

Author: Mesteery

docs/rules/prefer-t-throws.md

@@ -51,22 +51,7 @@ test('some test', async t => {
 const test = require('ava');
 
 test('some test', async t => {
-	const error = await t.throwsAsync(asyncThrowingFunction());
-	t.is(error.message, 'Unicorn overload');
-});
-```
-
-```js
-const test = require('ava');
-
-test('some test', async t => {
-	try {
-		const result = await potentiallyThrowingFunction();
-		// This passes because using a try-catch can be intentional, for example, to test both the result and the error:
-		// t.is(result, 'Unicorn success');
-	} catch (error) {
-		t.is(error.message, 'Unicorn overload');
-	}
+	await t.throwsAsync(asyncThrowingFunction(), {message: 'Unicorn overload'});
 });
 ```