how-to-build.md

@@ -33,6 +33,7 @@
     $ yarn global add react-native-cli
     $ yarn config set cache-folder /media/someGBstorage/yarn/cache/
     $ yarn
+    ```
     
 - forward 8081 ports if device is connected via USB (or change dev settings in device to connect via same WIFI to port 8081 on pc)