B OpenNebula/one#7355: Update whats new (space in group name)

Author: paczerny

content/software/release_information/release_notes/whats_new.md

@@ -93,3 +93,4 @@ Additionally, the following functionalities are present that were not in OpenNeb
 <!--keeping some examples-->
 - [Fix de-selecting hidden datatable entries](https://github.com/OpenNebula/one/issues/6781).
 - [Fireedge do not refresh actions on VM state change](https://github.com/OpenNebula/one/issues/7172).
+- [Do not allow space in group name](https://github.com/OpenNebula/one/issues/7355).