docs: Fix link in README
Correct rootfs builder link in the image builder README.
Fixes
@@ -17,7 +17,7 @@ $ sudo ./image_builder.sh path/to/rootfs
Where `path/to/rootfs` is the directory populated by `rootfs.sh`.
> **Note**: If you are building an image from an Alpine rootfs, see
-> the important note [here](rootfs-builder/README.md#rootfs-requirements).
+> the important note [here](/rootfs-builder/README.md#rootfs-requirements).
## Further information
