improve: showing showing server description in dropdown (via #5015)

* Showing server description in dropdown

* Slight syntax improvements

* use template strings and ` - `

src/core/plugins/oas3/components/servers.jsx

@@ -111,6 +111,7 @@ export default class Servers extends React.Component {
                 value={ server.get("url") }
                 key={ server.get("url") }>
                 { server.get("url") }
+                { server.get("description") && ` - ${server.get("description")}` }
               </option>
             ).toArray()}
           </select>