[analyzer] Fix a comment type in a constant test.

Fixing a typo from https://dart-review.googlesource.com/c/sdk/+/343460.

Change-Id: I069210b26a60a8b7ad1b66131fc529093e742e16
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/343762
Reviewed-by: Samuel Rawlins <[email protected]>
Reviewed-by: Phil Quitslund <[email protected]>
Commit-Queue: Kallen Tu <[email protected]>

Author: kallentu

pkg/analyzer/test/src/dart/constant/evaluation_test.dart

@@ -3569,7 +3569,7 @@ const c = double.nan == 2.3;
 ''', [
       error(WarningCode.UNNECESSARY_NAN_COMPARISON_FALSE, 10, 13),
     ]);
-    // This test case produces an warning, but the value of the constant should
+    // This test case produces a warning, but the value of the constant should
     // be `false`.
     final result = _topLevelVar('c');
     assertDartObjectText(result, r'''
@@ -3584,7 +3584,7 @@ const c = 2.3 == double.nan;
 ''', [
       error(WarningCode.UNNECESSARY_NAN_COMPARISON_FALSE, 14, 13),
     ]);
-    // This test case produces an warning, but the value of the constant should
+    // This test case produces a warning, but the value of the constant should
     // be `false`.
     final result = _topLevelVar('c');
     assertDartObjectText(result, r'''