Improve wrong number of args error message in propertize
* src/editfns.c (Fpropertize): Improve error message. (syms_of_editfns) <Qpropertize>: New DEFSYM. * test/src/editfns-tests.el (propertize/error-wrong-number-of-args): New test.
* src/editfns.c (Fpropertize): Improve error message. (syms_of_editfns) <Qpropertize>: New DEFSYM. * test/src/editfns-tests.el (propertize/error-wrong-number-of-args): New test.