Fix comments in defer/stream validation rules (graphql#3781)

Author: robrichard

src/validation/__tests__/DeferStreamDirectiveOnRootFieldRule-test.ts

@@ -160,7 +160,7 @@ describe('Validate: Defer/Stream directive on root field', () => {
     expectValid(`
       subscription {
         subscriptionField {
-          ...nestedFragment
+          ...nestedFragment @defer
         }
       }
       fragment nestedFragment on Message {

src/validation/rules/DeferStreamDirectiveLabelRule.ts

@@ -11,7 +11,7 @@ import {
 import type { ValidationContext } from '../ValidationContext.js';
 
 /**
- * Stream directive on list field
+ * Defer and stream directive labels are unique
  *
  * A GraphQL document is only valid if defer and stream directives' label argument is static and unique.
  */

src/validation/rules/DeferStreamDirectiveOnRootFieldRule.ts

@@ -10,7 +10,7 @@ import {
 import type { ValidationContext } from '../ValidationContext.js';
 
 /**
- * Stream directive on list field
+ * Defer and stream directives are used on valid root field
  *
  * A GraphQL document is only valid if defer directives are not used on root mutation or subscription types.
  */

src/validation/rules/StreamDirectiveOnListFieldRule.ts

@@ -9,7 +9,7 @@ import { GraphQLStreamDirective } from '../../type/directives.js';
 import type { ValidationContext } from '../ValidationContext.js';
 
 /**
- * Stream directive on list field
+ * Stream directives are used on list fields
  *
  * A GraphQL document is only valid if stream directives are used on list fields.
  */