AsyncGeneratorPrototype/*/name.js use "async-iteration", not "generator" (#1556)

test/built-ins/AsyncGeneratorPrototype/next/name.js

@@ -17,7 +17,7 @@ info: |
     object, if it exists, has the attributes { [[Writable]]: false,
     [[Enumerable]]: false, [[Configurable]]: true }.
 includes: [propertyHelper.js]
-features: [generators]
+features: [async-iteration]
 ---*/
 
 async function* g() {}

test/built-ins/AsyncGeneratorPrototype/return/name.js

@@ -17,7 +17,7 @@ info: |
     object, if it exists, has the attributes { [[Writable]]: false,
     [[Enumerable]]: false, [[Configurable]]: true }.
 includes: [propertyHelper.js]
-features: [generators]
+features: [async-iteration]
 ---*/
 
 async function* g() {}

test/built-ins/AsyncGeneratorPrototype/throw/name.js

@@ -17,7 +17,7 @@ info: |
     object, if it exists, has the attributes { [[Writable]]: false,
     [[Enumerable]]: false, [[Configurable]]: true }.
 includes: [propertyHelper.js]
-features: [generators]
+features: [async-iteration]
 ---*/
 
 async function* g() {}