[kernel] Update VariableDeclaration.name comment
[kernel] Update VariableDeclaration.name comment

Change-Id: I40336a0ea93b5384bd73e7c8810cdac8d029a014
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/258925
Commit-Queue: Nicholas Shahan <03847abd2d8aadfe859ecb98095a31f9f515dc47@google.com>
Reviewed-by: Nicholas Shahan <03847abd2d8aadfe859ecb98095a31f9f515dc47@google.com>
Auto-Submit: Johnni Winther <0f64ef784d57ffb064b634040f9eeba0d33d0be4@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk