Removed Geography API reference

Author: schnuerle

provider/README.md

@@ -111,7 +111,7 @@ At a minimum, paginated payloads must include a `next` key, which must be set to
 
 Municipalities requiring MDS Provider API compliance should provide an unambiguous digital source for the municipality boundary. This boundary must be used when determining which data each `provider` API endpoint will include.
 
-The boundary should be defined as a polygon or collection of polygons. The file defining the boundary should be provided in Shapefile or GeoJSON format and hosted online at a published address that all providers and `provider` API consumers can access and download. The boundary description can be sent as a reference to an GeoJSON object obtained via the Geography API or flat-file, if the agency is using Geography.
+The boundary should be defined as a polygon or collection of polygons. The file defining the boundary should be provided in Shapefile or GeoJSON format and hosted online at a published address that all providers and `provider` API consumers can access and download. The boundary description can be sent as a reference to an GeoJSON object or flat-file, if the agency is using Geography.
 
 Providers are not required to recalculate the set of historical data that is included when the municipality boundary changes. All new data must use the updated municipality boundary.