Welcome to OpenStreetMap and thanks for editing the map.

Usually addresses are stored in separate tags, which are easier for data consumers like routing software to process.

The person who initially mapped the buildings on the Newlands Estate put all the information into the name tag, which I have now "translated" into OSM tags. You didn't do anything wrong by following the existing mapping style with your edit.

I've also added some other information, like postcodes, to buildings and roads on the estate.

If you want to add more information to the map in your local area, the StreetComplete app is a great complement to the iD web editor which you used.