Boost documentation method’s input variable’s names in Synopsis

[mathbunnyru]

Why does documentation omits method’s input variable’s names in Synopsis section?

For example:
https://www.boost.org/doc/libs/1_69_0/doc/html/boost/interprocess/mapped_region.html

class mapped_region {
...
  bool flush(std::size_t = 0, std::size_t = 0, bool = true);
...
}

This looks bad for me, because there’s no way to understand the meaning of size_ts or bool. I think this synopsis doesn’t help as much as it could.

Hopefully, there is more appropriate description below:

bool flush(std::size_t mapping_offset = 0, std::size_t numbytes = 0, 
           bool async = true);

I think it would be good to have this in synopsis.