Fix spelling/grammar in test comment

Author: sophiebits

src/core/__tests__/ReactCompositeComponent-test.js

@@ -112,8 +112,8 @@ describe('ReactCompositeComponent', function() {
 
  it('should give context for PropType errors in nested components.', () => {
  // In this test, we're making sure that if a proptype error is found in a
- // component, we give a smal hint as to which parent instantiated that
- // component as per warnings about key-usage in ReactDescriptorValidator.
+ // component, we give a small hint as to which parent instantiated that
+ // component as per warnings about key usage in ReactDescriptorValidator.
  spyOn(console, 'warn');
  var MyComp = React.createClass({
  propTypes: {