wasapi: Clarify usage of low-latency property, add myself as author

wasapi: Clarify usage of low-latency property, add myself as author

The low-latency property is *always* safe to enable, so applications
that do realtime communication should set it, and the elements will
automatically configure WASAPI to use the lowest possible device
period, and the audioringbuffer in audiobasesink will also be
configured accordingly.

Applications can also use exclusive mode during capture and playback
for the lowest possible latency if they know that the device will not
be used by any other application.

In this mode, the latency-time and buffer-time properties will be
completely ignored.