docs(api) Fix cli table (#2640)

Fix broken table

Before: 
<img width="774" alt="screen shot 2018-11-13 at 12 28 44 pm" src="https://user-images.githubusercontent.com/10549495/48407609-e6723380-e73f-11e8-847c-dbdc91d4fb5f.png">

After:
<img width="758" alt="screen shot 2018-11-13 at 12 30 43 pm" src="https://user-images.githubusercontent.com/10549495/48407634-f722a980-e73f-11e8-9588-6770e84328e2.png">

Author: EugeneHlushko

src/content/api/cli.md

@@ -153,8 +153,8 @@ Parameter                 | Explanation                                 | Input
 `--config`                | Path to the config file                     | string     | webpack.config.js or webpackfile.js
 `--config-register, -r`   | Preload one or more modules before loading the webpack configuration | array |
 `--config-name`           | Name of the config to use                   | string     |
-`--env`                   | Environment passed to the config, when it is a function |
-`--mode`                  | Mode to use, either "development" or "production" | string      |
+`--env`                   | Environment passed to the config, when it is a function  | |
+`--mode`                  | Mode to use, either "development" or "production" | string |
 
 ### Output Options