util-docker: Fix correct common platform comment

Change-Id: Ifc703b47b1e59522ba01f4c2b59a4863779eefb1

util/dockerfiles/docker-bake.hcl

@@ -37,8 +37,8 @@ variable "TAG" {
 
 # Common attributes across all targets. Note: these can be overwritten.
 target "common" {
-  # Here we are enabling multi-platform builds. We are compiling to both ARM
-  # amd X86.
+  # Here we are enabling multi-platform builds. We are compiling to ARM, X86,
+  # and RISC-V.
   platforms = ["linux/amd64", "linux/arm64", "linux/riscv64"]
   pull = true
 }
@@ -242,4 +242,4 @@ target "devcontainer" {
   dockerfile = "Dockerfile"
   context = "devcontainer"
   tags = ["${IMAGE_URI}/devcontainer:${TAG}"]
-}
+}