feat: expand canaries to 114; refresh 3 with cfgcmd body fix

Adds 8 new visual-validated canaries from the post-cfgcmd-fix
BackstopJS run (2026-04-29):

- configuration/policy/as-path-list
- configuration/policy/community-list
- configuration/policy/extcommunity-list
- configuration/policy/large-community-list
- configuration/policy/local-route
- configuration/policy/prefix-list
- configuration/service/salt-minion
- configuration/system/updates

Refreshes 3 existing canaries whose MD content changed via the
cfgcmd/opcmd single-line body fix on myst/current fc19ab5c:

- configuration/firewall/global-options
- configuration/firewall/groups
- configuration/policy/route

All 11 sourced from origin/myst/current. Net: 106 -> 114 canaries.

🤖 Generated by [robots](https://vyos.io)

1 files changed, 35 insertions, 0 deletions

diff --git a/docs/configuration/system/md-updates.md b/docs/configuration/system/md-updates.md
new file mode 100644
index 00000000..8734788f
--- /dev/null
+++ b/docs/configuration/system/md-updates.md
@@ -0,0 +1,35 @@
+# Updates
+
+VyOS supports online checking for updates
+
+## Configuration
+
+```{cfgcmd} set system update-check auto-check
+
+Configure auto-checking for new images
+```
+
+```{cfgcmd} set system update-check url \<url\>
+
+Configure a URL that contains information about images.
+```
+
+## Example
+
+```none
+set system update-check auto-check
+set system update-check url 'https://raw.githubusercontent.com/vyos/vyos-rolling-nightly-builds/main/version.json'
+```
+
+Check:
+
+```none
+vyos@r4:~$ show system updates
+Current version: 1.5-rolling-202312220023
+
+Update available: 1.5-rolling-202312250024
+Update URL: https://github.com/vyos/vyos-rolling-nightly-builds/releases/download/1.5-rolling-202312250024/1.5-rolling-202312250024-amd64.iso
+vyos@r4:~$
+
+vyos@r4:~$ add system image latest
+```