Add descriptions

app/views/groups/group_members/_new_group_member.html.haml

@@ -20,6 +20,8 @@
       .clearable-input
         = text_field_tag :expires_at, nil, class: 'form-control js-access-expiration-date', placeholder: 'Select access expiration date'
         %i.clear-icon.js-clear-input
+      .help-block
+        On this date, the user(s) will automatically lose access to this group and all of its projects.
 
   .form-actions
     = f.submit 'Add users to group', class: "btn btn-create"

app/views/projects/group_links/index.html.haml

@@ -22,6 +22,8 @@
         .clearable-input
           = text_field_tag :expires_at, nil, class: 'form-control js-access-expiration-date', placeholder: 'Select access expiration date'
           %i.clear-icon.js-clear-input
+        .help-block
+          On this date, all users in the group will automatically lose access to this project.
       = submit_tag "Share", class: "btn btn-create"
   .col-lg-9.col-lg-offset-3
     %hr

app/views/projects/project_members/_new_project_member.html.haml

@@ -20,6 +20,8 @@
       .clearable-input
         = text_field_tag :expires_at, nil, class: 'form-control js-access-expiration-date', placeholder: 'Select access expiration date'
         %i.clear-icon.js-clear-input
+      .help-block
+        On this date, the user(s) will automatically lose access to this project.
 
   .form-actions
     = f.submit 'Add users to project', class: "btn btn-create"