add docblocks, closes #1653

app/views/admin/overlapping/courses.php

app/views/admin/overlapping/index.php

app/views/admin/overlapping/modul.php

app/views/admin/overlapping/overlapping.php

app/views/admin/overlapping/selection.php

app/views/admin/plugin/activation-error-form.php

app/views/admin/plugin/edit_automaticupdate.php

app/views/admin/plugin/index.php

app/views/admin/plugin/manifest.php

app/views/admin/plugin/search.php

app/views/admin/plugin/unregistered.php

app/views/admin/plugin/update_info.php

app/views/admin/plugin/upload-drag-and-drop.php

app/views/admin/role/add.php

app/views/admin/role/add_plugin.php

app/views/admin/role/assign_plugin_role.php

app/views/admin/role/assign_role.php

app/views/admin/role/assign_role_institutes.php

app/views/admin/role/index.php

app/views/admin/role/show_role.php