boost documentation bug

I'm used to doing a ```man -s 3 srqt``` and getting linker info ...
```
SQRT(3) Linux Programmer's Manual

NAME
sqrt, sqrtf, sqrtl - square root function

SYNOPSIS
#include

double sqrt(double x);
float sqrtf(float x);
long double sqrtl(long double x);

Link with -lm.
```

When I go to the boost::regex docs (https://www.boost.org/doc/libs/1_66_0/libs/regex/doc/html/index.html) there is no such information: **Link with -lboost_regex**
I think this is an oversight that should be corrected.

Start at the Boost.Regex documentation linked in the issue and locate the usage or build/linking guidance. Add the missing Boost.Regex linker information, then verify that the documentation clearly tells users how to link the library.

Written by the indexing model from the issue text.