misc: Update author information

Author information was added to any file
with the standard license text.
Authors were added that added/changed >= 3%
of the lines of a file.
diff --git a/layers/vk_layer_extension_utils.cpp b/layers/vk_layer_extension_utils.cpp
index 84ce0d1..7f383fa 100644
--- a/layers/vk_layer_extension_utils.cpp
+++ b/layers/vk_layer_extension_utils.cpp
@@ -20,8 +20,8 @@
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  *
- * Authors:
- *   Courtney Goeltzenleuchter <courtney@lunarg.com>
+ * Author: Courtney Goeltzenleuchter <courtney@LunarG.com>
+ *
  */
 
 #include "string.h"