style and doc fixes for newly imported Java package .m files * java/cell2mlstr.m, java/errordlg.m, java/helpdlg.m, java/inputdlg.m, java/javaArray.m, java/javaaddpath.m, java/javaclasspath.m, java/javafields.m, java/javamem.m, java/javamethods.m, java/javarmpath.m, java/listdlg.m, java/msgbox.m java/questdlg.m, java/warndlg.m: Style and doc fixes.

Copyright notices are intentionally omitted from the files in the
examples directory.  We don't want copyright notices cluttering the
manual.