Update style of sibling iteration

Co-authored-by: Ana María Martínez Gómez <anamaria@martinezgomez.name>
Co-authored-by: Dany Marcoux <dmarcoux@suse.com>
Co-authored-by: David Kang <dkang@suse.com>
Co-authored-by: Eduardo Navarro <enavarro@suse.com>
Co-authored-by: Saray Cabrera Padrón <scabrerapadron@suse.de>
Co-authored-by: Lukas Krause <lkrause@suse.com>