Fixed cocoa pod gem install instruction

[Umar-M-Haroon]

you need to use sudo to install the cocoapods deintegrate gem

[segiddins]

You only need sudo if you're using the default ruby installation and haven't changed your gem home. I believe elsewhere we write it [sudo], maybe we ought to do the same here?

[orta]

@Brown-amazingness cool, can you make this [sudo] we want people to know that it is optional please :dancers:

[segiddins]

@Brown-amazingness ping?

[segiddins]

Thanks!