chacha20poly1305: clarify the correct attribution for the AMD64 assembly.
chacha20poly1305: clarify the correct attribution for the AMD64 assembly.

Change-Id: I9c247e49a13788408b4fe49676520d608d8c4380
Reviewed-on: https://go-review.googlesource.com/31090
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Reviewed-by: Adam Langley <db68fba232b2c49ed3e9d3081df349dde7b61dfd@golang.org>

ScriptRock/crypto,ScriptRock/crypto,golang/crypto,golang/crypto,golang/crypto