Clarify that both RPPs and HNs can now contain letters
* House numbers are indexed on their own update schedule; RPP location and details go live almost immediately to existing road segments. Both house number and RPP search results are indexed separately. House numbers will normally be updated by the second road segment tile update. This ensures a new road segment is created in the segment database prior to adding the house number to the house number database, otherwise there may not be a linkable segment based on the different update schedules.
* House numbers only route to road segments with names; RPPs will route to any road segment named or not.
House numbers cannot contain letters; RPPs can contain letters.
* House numbers are [[House_Numbers_in_WME#Interpolation | Interpolated/extrapolated]]; RPPs are not interpolated/extrapolated.