docs: Delete reference to `cosa runc`
Was gone in previous commit.
@@ -67,7 +67,6 @@ Those less commonly used commands are listed here:
| [offline-update](https://github.com/coreos/coreos-assembler/blob/main/src/cmd-offline-update) | Given a disk image and a coreos-assembler build, use supermin to update the disk image to the target OSTree commit "offline"
| [prune](https://github.com/coreos/coreos-assembler/blob/main/src/cmd-prune) | This script removes previous builds. DO NOT USE on production pipelines
| [remote-prune](https://github.com/coreos/coreos-assembler/blob/main/src/cmd-remote-prune) | Removes unreferenced builds from s3 bucket
-| [runc](https://github.com/coreos/coreos-assembler/blob/main/src/cmd-runc) | Spawn the current build as a container
| [sign](https://github.com/coreos/coreos-assembler/blob/main/src/cmd-sign) | Implements signing with RoboSignatory via fedora-messaging
| [supermin-shell](https://github.com/coreos/coreos-assembler/blob/main/src/cmd-supermin-shell) | Get a supermin shell
| [tag](https://github.com/coreos/coreos-assembler/blob/main/src/cmd-tag) | Operate on the tags in `builds.json`
