Fix code indentation in Xcode

Before Xcode 9 (for Xcode 9 see default shortcut below)

1. select text
2. right-click
3. there’s a “Re-indent selection” item in popup menu

In XCode 4 there is one more step:

1. select text
2. right-click
3. Click on “Structure”
4. there’s a “Re-indent selection” and other options in popup menu

Or using the default shortcut:

1. select text
2. press ctrl + i