[Issue 18120] Document setting DRT options via the environment

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18120

greenify <greeenify at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|druntime                    |dlang.org
            Summary|Allow DRT options to be set |Document setting DRT
                   |via the environment         |options via the environment

--- Comment #3 from greenify <greeenify at gmail.com> ---
Let's keep this open and change the purpose? Improving the documentation? For
example, we could add a dedicated page about druntime's option to the spec.

--