HTMLMapmlViewerElement lat, lon, zoom WebIDL attributes' description needs update

[prushforth]

The documentation for lat, lon and zoom, at least in the table, is slightly unclear. It says (in all three cases):

"Get or set the map's (latitude). Reflects to the (lat) content attribute. No effect on map dynamic state."

This should be amended to

"Get or set the map's (latitude) property and attribute. Changing this value has no effect on the map viewport. Such changes can be achieved with the zoomTo() method."

The use of "reflect" is not quite right, according to the HTML spec. In that spec "reflect" seems to mean that content attribute changes reflect to the WebIDL attribute, but the reverse, that is changing the content attribute because the WebIDL attribute changes is described as "changing", not reflecting:

In general this means that the IDL attribute getter returns the current value of the content attribute, and the setter changes the value of the content attribute to the given value.