fix unit error in equipment data of mv lines and cables

Author: AnyaHe

edisgo/equipment/equipment-parameters_MV_cables.csv

@@ -1,5 +1,5 @@
 name,U_n,I_max_th,R_per_km,L_per_km,C_per_km
-#-,V,A,ohm/km,mH/km,uF/km
+#-,kV,A,ohm/km,mH/km,uF/km
 NA2XS2Y 3x1x185 RM/25,10,357,0.164,0.38,0.41
 NA2XS2Y 3x1x240 RM/25,10,417,0.125,0.36,0.47
 NA2XS2Y 3x1x300 RM/25,10,466,0.1,0.35,0.495

edisgo/equipment/equipment-parameters_MV_overhead_lines.csv

@@ -1,5 +1,5 @@
 name,U_n,I_max_th,R_per_km,L_per_km,C_per_km
-#-,V,A,ohm/km,mH/km,uF/km
+#-,kV,A,ohm/km,mH/km,uF/km
 48-AL1/8-ST1A,10,210,0.35,1.11,0.0104
 94-AL1/15-ST1A,10,350,0.33,1.05,0.0112
 122-AL1/20-ST1A,10,410,0.31,0.99,0.0115