Fix minor things based on code review

Author: donnieberg

components/button-stateful/index.jsx

@@ -78,7 +78,7 @@ const propTypes = {
 	 */
 	stateThree: PropTypes.object,
 	/**
-	 * Write <code>'-1'</code> if you don't want the user to tab to the button.
+	 * Write "-1" if you don't want the user to tab to the button.
 	 */
 	tabIndex: PropTypes.string,
 	tooltip: PropTypes.node,

components/date-picker/index.jsx

@@ -260,7 +260,7 @@ module.exports = React.createClass({
 			onInput,
 			pattern,
 			placeholder,
-			...props
+			...props // eslint-disable-line no-unused-vars
 		} = this.props;
 
 		let isInline;

components/global-navigation-bar/link.jsx

@@ -127,7 +127,7 @@ GlobalNavigationBarLink.propTypes = {
 	onMouseEnter: PropTypes.func,
 	onMouseLeave: PropTypes.func,
 	/**
-	 * Write <code>"-1"</code> if you don't want the user to tab to the button.
+	 * Write "-1" if you don't want the user to tab to the button.
 	 */
 	tabIndex: PropTypes.string
 };