Changed config node name for the skill experience modifiers from "Multiplier" to "Modifier"

Because the name was confusing.
This will break config settings, check your config.yml if you have
changed the skill experience modifiers.

src/main/resources/config.yml

@@ -238,6 +238,8 @@ Experience:
     Gains:
         Mobspawners:
             Enabled: false
+
+        # Experience gained in every skill will get multiplied by this value. 1.0 by default, 2.0 means two times as much
         Multiplier:
             PVP: 1.0
             Global: 1.0
@@ -245,7 +247,9 @@ Experience:
         Rewards: true
     Formula:
         Curve_Modifier: 20
-        Multiplier:
+
+        # Experience gained will get divided by these values. 1.0 by default, 2.0 means two times lower
+        Modifier:
             Swords: 1.0
             Taming: 1.0
             Acrobatics: 1.0