Fix generated Python code for Doxygen comments ending with quote

Single-line Doxygen comments ending with a double quote resulted in
syntactically-invalid Python docstrings in the output, so use triple
single quotes as delimiters in this case to avoid it.

Examples/test-suite/java/doxygen_misc_constructs_runme.java

@@ -185,6 +185,8 @@ public class doxygen_misc_constructs_runme {
                 "\n" +
                 " @param fileName name of the log file\n");
 
+    wantedComments.put("doxygen_misc_constructs.doxygen_misc_constructs.doc_ends_with_quote()",
+            "This doc comment ends with a quote: \"and that's ok\"");
 
     // and ask the parser to check comments for us
     System.exit(CommentParser.check(wantedComments));