typos in release notes for 6.13
typos in release notes for 6.13

ketchupok/csound,ketchupok/csound,ketchupok/csound,csound/csound,csound/csound,ketchupok/csound,csound/csound,ketchupok/csound,ketchupok/csound,csound/csound,ketchupok/csound,csound/csound,csound/csound,csound/csound,ketchupok/csound,csound/csound,ketchupok/csound,csound/csound,ketchupok/csound,csound/csound