user*, group*, add*, group*: add more info links (#5738)

* user*, group*, add*, group*:add more info links

* user*, group*: remove section numbers from manned.org links

* adduser, deluser: remove en locale from info links

* Update pages.it/linux/adduser.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

* Update pages.it/linux/deluser.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

* Update pages.pt_BR/linux/adduser.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

* Update pages.zh/linux/adduser.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

* Update pages/linux/adduser.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

* Update pages/linux/deluser.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

* Update pages.ko/linux/deluser.md

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

pages.es/linux/groupdel.md

@@ -1,6 +1,7 @@
 # groupdel
 
 > Elimina del sistema grupos de usuarios existentes.
+> Más información: <https://manned.org/groupdel>.
 
 - Borra un grupo existente:
 

pages.es/linux/userdel.md

@@ -1,6 +1,7 @@
 # userdel
 
 > Elimina un usuario.
+> Más información: <https://manned.org/userdel>.
 
 - Elimina un usuario y su directorio personal: