[clang-tidy] update docs for new hungarian identifier-naming types (unsigned char and void)

[amurzeau]

Summary

Since 37e6a4f9496c8e35efc654d7619a79d6dbb72f99, void and
unsigned char were added to primitive types for hungarian notation.

This commit adds them to the documentation.

[amurzeau]

I don't have commit access to the repo, so please commit this for me when accepted. Thanks!