[docs] Remove newline in the version
[docs] Remove newline in the version

The newline at the end of the version.xml.in file added a newline
to the version entity we use in the API reference text and title.

Distrotech/clutter-gtk,GNOME/clutter-gtk,Distrotech/clutter-gtk,GNOME/clutter-gtk,Distrotech/clutter-gtk