fixup! feat(extensions): add netboot extension for TFTP+NFS diskless boot

Author: iav

extensions/netboot/README.md

@@ -134,7 +134,7 @@ network router (see next section).
 
 Directory layout:
 
-```
+```text
 /srv/netboot/
   tftp/                                      # TFTP root (= TFTP_DIRECTORY)
     pxelinux.cfg/
@@ -156,7 +156,7 @@ Directory layout:
 
 ### `/etc/default/tftpd-hpa`
 
-```
+```sh
 TFTP_USERNAME="tftp"
 TFTP_DIRECTORY="/srv/netboot/tftp"
 TFTP_ADDRESS=":69"
@@ -168,7 +168,7 @@ IPv6 bind conflicts on dual-stack hosts.
 
 ### `/etc/exports`
 
-```
+```text
 /srv/netboot/rootfs          *(ro,sync,no_subtree_check,no_root_squash,crossmnt,fsid=0)
 /srv/netboot/rootfs/shared   *(rw,sync,no_subtree_check,no_root_squash)
 /srv/netboot/rootfs/hosts    *(rw,sync,no_subtree_check,no_root_squash)
@@ -462,7 +462,7 @@ Pull the SD/eMMC out of the Helios64 (or rearrange `boot_targets` so
 `pxe` sits before `mmc*`), power it on, and watch the U-Boot console
 (`ttyS2 @ 1500000`):
 
-```
+```text
 Scanning bootdev 'ethernet@fe300000.bootdev':
   DHCP client bound to address 192.168.1.130
   *** Unhandled DHCP Option in OFFER: 54
@@ -541,7 +541,7 @@ support (`update-initramfs -u` with `MODULES=most` in
 local bootflow is found. Either physically remove the local media or
 re-order `boot_targets` in U-Boot env:
 
-```
+```text
 => env set boot_targets "pxe dhcp mmc1 mmc0 scsi0 usb0"
 => env save
 ```