Refactor to a more descriptive name,

also fixes a small typo.

src/main/java/com/gmail/nossr50/config/Config.java

@@ -297,5 +297,5 @@ public class Config extends AutoUpdateConfigLoader {
 
     /* XP Formula Multiplier */
     public int getFormulaMultiplierCurve() { return config.getInt("Experience.Formula.Curve_Modifier", 20); }
-    public double getForumulaMultiplier(SkillType skill) { return config.getDouble("Experience.Formula.Modifier." + StringUtils.getCapitalized(skill.toString())); }
+    public double getFormulaSkillModifier(SkillType skill) { return config.getDouble("Experience.Formula.Modifier." + StringUtils.getCapitalized(skill.toString())); }
 }

src/main/java/com/gmail/nossr50/datatypes/skills/SkillType.java

@@ -108,7 +108,7 @@ public enum SkillType {
     }
 
     public double getXpModifier() {
-        return Config.getInstance().getForumulaMultiplier(this);
+        return Config.getInstance().getFormulaSkillModifier(this);
     }
 
     public static SkillType getSkill(String skillName) {