As the author of the blog post, would you be willing to change its title to "The Jim Roskind C and C++ Grammars"? The text makes it very clear that you know that C and C++ are separate languages, and that the archives actually contain separate grammar files for these separate languages. As they should.

From past experience I find "C/C++" a very grating term. Back when I was reading comp.lang.c, "C/C++" was used in questions by particular brands of people, who tried to compile C++ with a C compiler, or compile C with a C++ compiler, or use C++ features in what they thought was C, or in general were confused about the fact that there is no single language called "C/C++", but rather two separate, incompatible languages called "C" and "C++". Anyway, wouldn't it be good to not add to the (potential) confusion?