Added "Milli" prefix for "StandardGravity" of acceleration type (#813)

Author: MitchGH

Common/UnitDefinitions/Acceleration.json

@@ -137,12 +137,13 @@
       },
       "FromUnitToBaseFunc": "x*9.80665",
       "FromBaseToUnitFunc": "x/9.80665",
+      "Prefixes": [ "Milli"],
       "Localization": [
         {
           "Culture": "en-US",
           "Abbreviations": [ "g" ]
         },
-		{
+        {
           "Culture": "ru-RU",
           "Abbreviations": [ "g" ]
         }

UnitsNet.NumberExtensions.Tests/GeneratedCode/NumberToAccelerationExtensionsTest.g.cs

@@ -33,6 +33,8 @@ public class AccelerationTests : AccelerationTestsBase
 
         protected override double KnotsPerSecondInOneMeterPerSecondSquared => 1.94384449244060;
 
+        protected override double MillistandardGravityInOneMeterPerSecondSquared => 101.9716212977928;
+
         [Fact]
         public void AccelerationTimesDensityEqualsSpecificWeight()
         {