linux/*: replace man.archlinux.com link (#7861)

* linux/*: replace man.archlinux.com

Does not replace links of pages directly associated with archlinux (eg: pacman)

* nmcli-device, nmcli-connection: use author's link

pages/linux/dunstify.md

@@ -2,7 +2,7 @@
 
 > A notification tool that is an extension of notify-send, but has more features based around dunst.
 > Works with all options that work for notify-send.
-> More information: <https://wiki.archlinux.org/title/Dunst#Dunstify>.
+> More information: <https://github.com/dunst-project/dunst/wiki/Guides>.
 
 - Show a notification with a given title and message:
 

pages/linux/homectl.md

@@ -1,7 +1,7 @@
 # homectl
 
 > Create, remove, change or inspect home directories using the systemd-homed service.
-> More information: <https://man.archlinux.org/man/homectl.1>.
+> More information: <https://manned.org/homectl>.
 
 - List user accounts and their associated home directories:
 

pages/linux/nmcli-connection.md

@@ -1,7 +1,7 @@
 # nmcli connection
 
 > Connection management with NetworkManager.
-> More information: <https://man.archlinux.org/man/nmcli.1>.
+> More information: <https://networkmanager.dev/docs/api/latest/nmcli.html>.
 
 - List all NetworkManager connections (shows name, UUID, type and device):
 

pages/linux/nmcli-device.md

@@ -1,7 +1,7 @@
 # nmcli device
 
 > Hardware device management with NetworkManager.
-> More information: <https://man.archlinux.org/man/nmcli.1>.
+> More information: <https://networkmanager.dev/docs/api/latest/nmcli.html>.
 
 - Print the statuses of all network interfaces:
 

pages/linux/xdg-open.md

@@ -1,7 +1,7 @@
 # xdg-open
 
 > Opens a file or URL in the user's preferred application.
-> More information: <https://man.archlinux.org/man/xdg-open.1>.
+> More information: <https://portland.freedesktop.org/doc/xdg-open.html>.
 
 - Open the current directory in the default file explorer: