docs: Fix workaround solution for ConfigPath
In the workaround solution of ConfigPath, there is a '$@'
missing in the script, so add it.
Fixes:
@@ -204,7 +204,7 @@ shell script with the following:
```bash
#!/bin/bash
-KATA_CONF_FILE=/etc/kata-containers/firecracker.toml containerd-shim-kata-v2
+KATA_CONF_FILE=/etc/kata-containers/firecracker.toml containerd-shim-kata-v2 $@
```
Name it as `/usr/local/bin/containerd-shim-katafc-v2` and reference it in the configuration of containerd:
