corrected description of the used units for earth radius.

Author: IvoBiaus

packages/turf-helpers/README.md

@@ -49,7 +49,7 @@ Type: ([Feature][7] | [FeatureCollection][8] | [Geometry][9] | [GeometryCollecti
 
 ## earthRadius
 
-The Earth radius in kilometers. Used by Turf modules that model the Earth as a sphere. The [mean radius][11] was selected because it is [recommended ][12] by the Haversine formula (used by turf/distance) to reduce error.
+The Earth radius in meters. Used by Turf modules that model the Earth as a sphere. The [mean radius][11] was selected because it is [recommended ][12] by the Haversine formula (used by turf/distance) to reduce error.
 
 Type: [number][13]
 

packages/turf-helpers/index.ts

@@ -97,7 +97,7 @@ export type AllGeoJSON =
   | GeometryCollection;
 
 /**
- * The Earth radius in kilometers. Used by Turf modules that model the Earth as a sphere. The {@link https://en.wikipedia.org/wiki/Earth_radius#Arithmetic_mean_radius mean radius} was selected because it is {@link https://rosettacode.org/wiki/Haversine_formula#:~:text=This%20value%20is%20recommended recommended } by the Haversine formula (used by turf/distance) to reduce error.
+ * The Earth radius in meters. Used by Turf modules that model the Earth as a sphere. The {@link https://en.wikipedia.org/wiki/Earth_radius#Arithmetic_mean_radius mean radius} was selected because it is {@link https://rosettacode.org/wiki/Haversine_formula#:~:text=This%20value%20is%20recommended recommended } by the Haversine formula (used by turf/distance) to reduce error.
  *
  * @constant
  */