Do you know On the Ground Rule?
Map what's on the ground
Edit
Sometimes there's conflicting information about, say, the name of a place. An old map might call it one thing, current maps another, and the place name sign something else. People using our maps (for navigation) won't care about the spelling in other maps, they need to find the names on local signs on the map and vice versa. The only exception to this could be obvious misspellings on signs like John-F.-Kennwdy Square. Assuming that people would intuitively look for the correct spelling, perhaps not even noticing the wrongly spelt name at all, it makes sense to correct these. 


See
https://wiki.openstreetmap.org/wiki/Good_practice#Map_what's_on_the_ground
https://wiki.openstreetmap.org/wiki/Disputes#On_the_Ground_Rule