That doesn't show the stop area but does show some information
about the reference number of the bus stop from a field that's
valid for most bus stops in OSM in the UK (but not elsewhere).
Other maps will show different things again. As long as you make
sure that you use valid tags in OSM (e.g. don't misuse the "name"
field on a bus stop for something which is not the name)
everything will be OK.