vulkan/util: fix typo in comment

Signed-off-by: Eric Engestrom <eric.engestrom@imgtec.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>

src/vulkan/util/gen_enum_to_str.py

@@ -19,7 +19,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-"""Create enum to string functions for vulking using vk.xml."""
+"""Create enum to string functions for vulkan using vk.xml."""
 
 from __future__ import print_function
 import argparse