sudo, pkexec, doas, run0: refer to each other. (#19281)

Author: Managor

pages/common/doas.md

@@ -1,6 +1,7 @@
 # doas
 
 > Execute a command as another user.
+> See also: `sudo`, `pkexec`, `run0`.
 > More information: <https://man.openbsd.org/doas>.
 
 - Run a command as root:

pages/common/sudo.md

@@ -1,6 +1,7 @@
 # sudo
 
 > Execute a single command as the superuser or another user.
+> See also: `pkexec`, `run0`, `doas`.
 > More information: <https://www.sudo.ws/sudo.html>.
 
 - Run a command as the superuser:

pages/linux/pkexec.md

@@ -2,6 +2,7 @@
 
 > Execute commands as another user.
 > Asks for password in a GUI if available.
+> See also: `sudo`, `run0`, `doas`.
 > More information: <https://polkit.pages.freedesktop.org/polkit/pkexec.1.html>.
 
 - Run command as root:

pages/linux/run0.md

@@ -2,6 +2,7 @@
 
 > Elevate privileges interactively.
 > Similar to `sudo`, but it's not a SUID binary, authentication takes place via polkit, and commands are invoked from a `systemd` service.
+> See also: `sudo`, `pkexec`, `doas`.
 > More information: <https://www.freedesktop.org/software/systemd/man/run0.html>.
 
 - Run a command as root: