Fix doxygen brief description.
@@ -44,7 +44,7 @@ PROJECT_NUMBER = @TINYSPLINE_VERSION@
# for a project that appears at the top of each page and should give viewer a
# quick idea about the purpose of the project. Keep the description short.
-PROJECT_BRIEF = @TINYSPLINE_SUMMARY@
+PROJECT_BRIEF = "@TINYSPLINE_SUMMARY@"
# With the PROJECT_LOGO tag one can specify a logo or an icon that is included
# in the documentation. The maximum height of the logo should not exceed 55
