[FIX] hr: fix some UI elements

Detailed Reason in Employee Departure wizard now has a placeholder, and an
unnecessary visual separator is removed.

task-3046435

closes odoo/odoo#108314

Related: odoo/enterprise#34288
Signed-off-by: Kevin Baptiste <kba@odoo.com>

addons/hr/wizard/hr_departure_wizard_views.xml

@@ -21,7 +21,6 @@
                                 <!-- Override invisible="1" when inheriting -->
                                 <div class="column" id="activities" invisible="1">
                                 </div>
-                                <separator colspan="2"/>
                                 <div class="o_td_label" id="label_info">
                                     <span class="o_form_label o_hr_form_label cursor-default">HR Info</span>
                                 </div>
@@ -33,7 +32,7 @@
                         <group>
                             <div id="detailed_reason" colspan="2">
                                 <span class="o_form_label o_hr_form_label cursor-default">Detailed Reason</span>
-                                <field name="departure_description"/>
+                                <field name="departure_description" placeholder="Give more details about the reason of archiving the employee."/>
                             </div>
                         </group>
                     </sheet>