style(demande): improve margins between info generates parts

app/views/shared/dossiers/_infos_generales.html.haml

@@ -1,5 +1,5 @@
-%div
-  %p.fr-my-2w.fr-px-4v
+.fr-px-2w
+  %p.fr-my-2w
     = t(:submitted_at, scope: [:views, :shared, :dossiers, :form], datetime: l(dossier.depose_at))
     %br
     - if dossier.last_champ_updated_at.present? && dossier.last_champ_updated_at > dossier.depose_at
@@ -7,22 +7,23 @@
 
 
   - if dossier.justificatif_motivation.attached?
-    .fr-my-4v.fr-px-4v
+    -# download component already has margin bottom
+    %div
       %p.champ-label Justificatif :
-      .champ-content.fr-text-action-high--grey
+      .champ-content
         .action
           = render Attachment::ShowComponent.new(attachment: dossier.justificatif_motivation.attachment)
 
   - if dossier.motivation.present?
-    .fr-my-4v.fr-px-4v
+    .fr-mb-2w
       %p.champ-label Motivation :
-      .champ-content.fr-text-action-high--grey
+      .champ-content
         .action
           = dossier.motivation
 
   - if dossier.attestation.present?
-    .fr-my-4v.fr-px-4v
+    .fr-mb-2w
       %p.champ-label Attestation :
-      .champ-content.fr-text-action-high--grey
+      .champ-content
         .action
           = link_to('Voir l’attestation', attestation_instructeur_dossier_path(dossier.procedure, dossier), target: '_blank', rel: 'noopener')