pages*: update outdated pages (#11821)

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>
Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: Isaac Vicente <isaacvicentsocial@gmail.com>

pages.ca/linux/useradd.md

@@ -30,4 +30,4 @@
 
 - Crea un usuari nou del sistema sense directori home:
 
-`sudo useradd --no-create-home --system {{nom_usuari}}`
+`sudo useradd --system {{nom_usuari}}`