More correct for Float values

Author: johnno1962

docs/ABI/RegisterAllocation.md

@@ -7,7 +7,7 @@ From Swift 5, the calling convention register allocation for 64 architectures is
 | Context register (self) | x20 | r13 |
 | Error return register | x21 | r12 |
 | Struct return pointer | x8 | rax |
-| Float call arguments | d0 … d7 | xmm0 … xmm7 |
+| Float call arguments | v0 … v7 | xmm0 … xmm7 |
 | Integer call arguments | x0 … x7 | rdi, rsi, rdx, rcx, r8, r9 |
-| Float return | d0, d1 | xmm0, xmm1 |
+| Float return | v0 … v3 | xmm0 … xmm3 |
 | Integer return | x0 … x3 | rax, rdx, rcx, r8 |