docs: fix inconsistent reference to rootfs.ext4
Steps 1 and 2 listed in the documentation should use the same path
@@ -60,7 +60,7 @@ To build an EXT4 image:
on how much data you'll want to fit inside:
```bash
- dd if=/dev/zero of=/rootfs.ext4 bs=1M count=50
+ dd if=/dev/zero of=rootfs.ext4 bs=1M count=50
```
2. Create an empty file system on the file you created:
