doc: fix variable name

Author: asmfstatoil

src/main/java/neqsim/thermo/system/SystemInterface.java

@@ -2262,9 +2262,9 @@ public void setImplementedTemperatureDeriativesofFugacity(
   /**
    * method to set mixing rule used for the fluid.
    *
-   * @param mr EosMixingRuleTypes enum
+   * @param emrt EosMixingRuleTypes enum
    */
-  public void setMixingRule(EosMixingRuleType mr);
+  public void setMixingRule(EosMixingRuleType emrt);
 
   /**
    * method to set mixing rule used for the fluid.