Fixes for code review comments.

src/components/App.jsx

@@ -442,7 +442,7 @@ export default class App extends React.Component {
 
     let mapElement;
 
-    // Check if OL3 code has been loaded?
+    // Check if OL code has been loaded?
     if(renderer === 'ol') {
       mapElement = <OpenLayersMap
         {...mapProps}

src/components/modals/SettingsModal.jsx

@@ -103,7 +103,7 @@ class SettingsModal extends React.Component {
           data-wd-key="modal-settings.maputnik:renderer" 
           options={[
             ['mbgljs', 'MapboxGL JS'],
-            ['ol', 'Open Layers 3 (experimental)'],
+            ['ol', 'Open Layers (experimental)'],
           ]}
           value={metadata['maputnik:renderer'] || 'mbgljs'}
           onChange={this.changeMetadataProperty.bind(this, 'maputnik:renderer')}