Trivial: Fixing typo in 2 comments in ash/wm.

R=sammiequon

Change-Id: I1ded7b5ca3db14c4593c95e55d0edbc70fb43ca1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918908
Auto-Submit: Chris Hall <chrishall@chromium.org>
Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Chris Hall <chrishall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#716066}

ash/wm/overview/overview_highlight_controller.cc

@@ -385,7 +385,7 @@ void OverviewHighlightController::UpdateFocusWidget(
   OverviewHighlightableView* previous_view = highlighted_view_;
   highlighted_view_ = view_to_be_highlighted;
 
-  // Perform accessiblity related tasks.
+  // Perform accessibility related tasks.
   highlighted_view_->GetView()->NotifyAccessibilityEvent(
       ax::mojom::Event::kSelection, true);
   // Note that both magnifiers are mutually exclusive. The overview "focus"

ash/wm/overview/overview_session.cc

@@ -171,7 +171,7 @@ void OverviewSession::Init(const WindowList& windows,
   UpdateNoWindowsWidget();
 
   // Create the widget that will receive focus while in overview mode for
-  // accessiblity purposes.
+  // accessibility purposes.
   overview_focus_widget_ = std::make_unique<views::Widget>();
   views::Widget::InitParams params;
   params.type = views::Widget::InitParams::TYPE_WINDOW_FRAMELESS;