Security Profile docs need updating

[SimonBrazell]

Hello,

Love your work, just got some feedback on the cloud services docs after having just gone through the setup for my first app.

Just wanted to let you guys know that the Ionic Security Profiles docs are a little out of sync with how FCM looks now. The FCM Server key required to setup the Android push messages is in fact the 'Legacy server key', not the 'Server key':

This might be obvious to some but I just spent the morning trying to work out why push messages were working fine for iOS and not Android.

Cheers,
Simon