Automated documentation update (devcontainers#840)

Automated documentation update [skip ci]

Co-authored-by: github-actions <github-actions@github.com>

Author: devcontainers-bot

src/docker-in-docker/README.md

@@ -17,6 +17,7 @@ Create child containers *inside* a container, independent from the host's docker
 |-----|-----|-----|-----|
 | version | Select or enter a Docker/Moby Engine version. (Availability can vary by OS version.) | string | latest |
 | moby | Install OSS Moby build instead of Docker CE | boolean | true |
+| mobyBuildxVersion | Install a specific version of moby-buildx when using Moby. (2024-02-09: Microsoft's Package Manifest has mismatching filesize and SHA for 0.12.1; default is last known good version) | string | 0.12.0 |
 | dockerDashComposeVersion | Default version of Docker Compose (v1 or v2 or none) | string | v1 |
 | azureDnsAutoDetection | Allow automatically setting the dockerd DNS server when the installation script detects it is running in Azure | boolean | true |
 | dockerDefaultAddressPool | Define default address pools for Docker networks. e.g. base=192.168.0.0/16,size=24 | string | - |