[FIX] project: outdated message

Issues has been removed some time ago.

opw-1920007

closes odoo/odoo#29837

addons/project/models/project.py

@@ -120,7 +120,7 @@ class Project(models.Model):
             'view_mode': 'kanban,tree,form',
             'view_type': 'form',
             'help': _('''<p class="o_view_nocontent_smiling_face">
-                        Documents are attached to the tasks and issues of your project.</p><p>
+                        Documents are attached to the tasks of your project.</p><p>
                         Send messages or log internal notes with attachments to link
                         documents to your project.
                     </p>'''),