par command does not allow n command in its first line(title)

Doxygen used to allow this but there was a regression, which is
apparently not being fixed:
https://github.com/doxygen/doxygen/issues/6304

Change-Id: I7602236522a56c30a2249bd8065796b3c6458704
Reviewed-on: https://gerrit.libreoffice.org/70377Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>
Tested-by: Michael Stahl <Michael.Stahl@cib.de>

odk/docs/cpp/Doxyfile

@@ -30,7 +30,7 @@ HTML_TIMESTAMP = NO
 
 GENERATE_LATEX = NO
 
-ALIASES = "derive=\par Derive: \n"
+ALIASES = "derive=\par Derive:"
 
 MACRO_EXPANSION = YES
 EXPAND_ONLY_PREDEF = YES