SWDEV-448163 - Fix Doxygen warnings

Change-Id: If72e312461a72920b6a482009c9aef4cf92f2e1b

catch/unit/printf/printfLength.cc

@@ -85,3 +85,8 @@ x
   REQUIRE(0 == proc.run());
   REQUIRE(proc.getOutput() == reference);
 }
+
+/**
+* End doxygen group PrintfTest.
+* @}
+*/