Updated docs to show faster installation
Updated docs to show faster installation

I just installed fastlane on a fresh Mac and it took longer than it should. By providing those additional parameters the installation is faster. This adds complexity.

Originally 
```
gem install fastlane
```
and now 
```
sudo gem install fastlane --verbose --no-ri --no-rdoc
```

We should probably do some additional testing on fresh Macs to see if it's worth the extra complexity

Via https://stackoverflow.com/questions/1381725/how-to-make-no-ri-no-rdoc-the-default-for-gem-install
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