Proof reading on Isolate.exit() docs
Proof reading on Isolate.exit() docs

Change-Id: I62b8dc76afa2ebcd0be395bd77b33156978e0dd8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/216291
Reviewed-by: Alexander Aprelev <dfb74c35a357c2059971a4bf7fe26b6a7c18085d@google.com>
Commit-Queue: Michael Thomsen <5977a55c75bb4612004451a56b0b4c22d9d3311d@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