There are licensing issues with using data from other maps. The best source is your observations of the real place. Using data from govmaps is essentially copying data from other source, and there is a chance that govmaps' license doesn't allow this. 
No worries, I fixed this street name.

We always welcome new contributors, but since this project is big and has well-established rules - it's a good idea to try to follow them. 
If you are unsure - you can ask somebody to review your changes or just leave a note and eventually somebody will do the fix.