Updated stlying of title and date range of milestone list

app/assets/stylesheets/pages/milestone.scss

@@ -255,8 +255,6 @@
 
 .milestone-range {
   color: $gl-text-color-tertiary;
-  margin: $gl-bar-padding 0 $gl-padding-4;
-  font-size: $tooltip-font-size;
 }
 
 @include media-breakpoint-down(xs) {

app/views/shared/_milestone_expired.html.haml

 - if milestone.due_date || milestone.start_date
-  .milestone-range
+  .milestone-range.append-bottom-5
     = milestone_date_range(milestone)
 - if milestone.expired? and not milestone.closed?
   .status-box.status-box-expired Expired

app/views/shared/milestones/_milestone.html.haml

@@ -5,7 +5,7 @@
 %li{ class: "milestone milestone-#{milestone.closed? ? 'closed' : 'open'}", id: custom_dom_id }
   .row
     .col-sm-6
-      %div
+      .append-bottom-5
         %strong= link_to truncate(milestone.title, length: 100), milestone_path
         - if @group
           = " - #{milestone_type}"