Fix checkstyle violations (#163)

Author: matthewelwell

src/main/java/com/flagsmith/config/FlagsmithConfig.java

@@ -277,8 +277,8 @@ public Builder withOfflineHandler(IOfflineHandler offlineHandler) {
 
     /**
      * Specify the list of protocols supported for calls to the server.
+     *
      * @param supportedProtocols the list of supported protocols
-     * @return
      */
     public Builder withSupportedProtocols(List<Protocol> supportedProtocols) {
       this.supportedProtocols.clear();