docs(Button): Update PropTypes and added DefaultProps (#1379)

docs/lib/Components/ButtonsPage.js

@@ -34,23 +34,42 @@ export default class ButtonsPage extends React.Component {
           <PrismCode className="language-jsx">
 {`Button.propTypes = {
   active: PropTypes.bool,
+  'aria-label': PropTypes.string,
   block: PropTypes.bool,
   color: PropTypes.string, // default: 'secondary'
   disabled: PropTypes.bool,
+  outline: PropTypes.bool,
 
   // Pass in a Component to override default button element
   // example: react-router Link
   // default: 'button'
-  tag: PropTypes.oneOfType([PropTypes.func, PropTypes.string]),
+  tag: PropTypes.oneOfType([
+    PropTypes.func,
+    PropTypes.string,
+    PropTypes.shape({ $$typeof: PropTypes.symbol, render: PropTypes.func }),
+    PropTypes.arrayOf(PropTypes.oneOfType([
+      PropTypes.func,
+      PropTypes.string,
+      PropTypes.shape({ $$typeof: PropTypes.symbol, render: PropTypes.func }),
+    ]))
+  ]),
 
   // ref will only get you a reference to the Button component, use innerRef to get a reference to the DOM element (for things like focus management).
-  innerRef: PropTypes.oneOfType([PropTypes.func, PropTypes.string]),
+  innerRef: PropTypes.oneOfType([PropTypes.object, PropTypes.func, PropTypes.string]),
 
   onClick: PropTypes.func,
   size: PropTypes.string,
+  children: PropTypes.node,
+  className: PropTypes.string,
+  cssModule: PropTypes.object,
 
   // use close prop for BS4 close icon utility
   close: PropTypes.bool,
+}
+
+Button.defaultProps = {
+  color: 'secondary',
+  tag: 'button',
 }`}
           </PrismCode>
         </pre>