📝 Simpilify the structure of API references.

docs/api/shell.md

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+# shell
+
+The `shell` module provides functions related to desktop integration.
+
+An example of opening a URL in default browser:
+
+```javascript
+var shell = require('shell');
+shell.openExternal('https://github.com');
+```
+
+## shell.showItemInFolder(fullPath)
+
+* `fullPath` String
+
+Show the given file in a file manager. If possible, select the file.
+
+## shell.openItem(fullPath)
+
+* `fullPath` String
+
+Open the given file in the desktop's default manner.
+
+## shell.openExternal(url)
+
+* `url` String
+
+Open the given external protocol URL in the desktop's default manner. (For
+example, mailto: URLs in the default mail user agent.)
+
+## shell.moveItemToTrash(fullPath)
+
+* `fullPath` String
+
+Move the given file to trash.
+
+## shell.beep()
+
+Play the beep sound.