Update MixtureFinder

Author: HuaiyanRen

doc/Complex-Models.md

@@ -148,7 +148,7 @@ Here, we specify two mixture components and four Gamma rate categories. Effectiv
 
 ### MixtureFinder
 
-MixtureFinder is an approach to select the optimum number of classes for a mixture model of Q matrices. To run MixtureFinder:
+MixtureFinder is an approach to select the optimum number of classes and the substitution model in each class for a mixture model of Q matrices. To run MixtureFinder:
 
 	iqtree -s example.phy -m MF+MIX
 
@@ -173,10 +173,10 @@ Options for ModelFinder also work for MixtureFinder, e.g.:
 The `-mset HKY,GTR` means we select subtitution model type among only `HKY` and `GTR` substitution models in each iteration of adding one more class. The `-mrate E,I,G,I+G` means we select the rate heterogeneity across sites models among `+E`, `+I`, `G` and `+I+G` models.
 
 Other options for MixtureFinder:
-| Model option  | Description                                                                                                    |
-| ------------- | -------------------------------------------------------------------------------------------------------------- |
-| `-qmax`       | Maximum number of Q-mixture classes (default: 10). Specify a number after the option (e.g., `-qmax 5`).        |
-| `-mate-twice` | estimate the rate heterogeneity across sites models again after select the best Q-mixture model (default: off) |
+| Model option   | Description                                                                                                   |
+| -------------- | ------------------------------------------------------------------------------------------------------------- |
+| `-qmax`        | Maximum number of Q-mixture classes (default: 10). Specify a number after the option (e.g., `-qmax 5`).       |
+| `-mrate-twice` | estimate the rate heterogeneity across sites models again after select the best Q-mixture model (default: on) |
 
 
 ### Profile mixture models