Merge pull request #9 from facebook/master

Update ReactFiberScheduler.js (facebook#14477)

packages/react-reconciler/src/ReactFiberScheduler.js

@@ -1266,7 +1266,7 @@ function renderRoot(root: FiberRoot, isYieldy: boolean): void {
             subscriber.onWorkStarted(interactions, threadID);
           } catch (error) {
             // Work thrown by an interaction tracing subscriber should be rethrown,
-            // But only once it's safe (to avoid leaveing the scheduler in an invalid state).
+            // But only once it's safe (to avoid leaving the scheduler in an invalid state).
             // Store the error for now and we'll re-throw in finishRendering().
             if (!hasUnhandledError) {
               hasUnhandledError = true;