libc_bitflags doesn't group constants in documentation

[Susurrus]

Looking through the documentation generated from the sys/termios library for example (see #527) you can see that all the constants are listed in one big lump instead of grouped like how they are in the source. Additionally, when looking at these bitflags in the docs, they don't have any of their constants listed under them. You actually have to read the source to figure out what constants are part of sys::termios::InputFlags for example.

[Susurrus]

This was resolved with the merge of #801.