Wrong brief on field

[long1eu]

firebase-ios-sdk/FirebaseAuth/Sources/AuthProvider/GameCenter/FIRGameCenterAuthCredential.h

Line 53 in 90a1aff

@brief The date and time that the signature was created.

I'm doing a port to Dart so I thought it would be nice to flag stuff that I found along the way. :D

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[paulb777]

Thanks for the report! Fixing in #6372.