Update MixtureFinder

Author: HuaiyanRen

doc/Complex-Models.md

@@ -156,13 +156,13 @@ Here, we estimate the optimal Q mixture model. To select mixture model and then
 
 	iqtree -s example.phy -m MIX+MFP
 
-BIC is the default criterion to assess the number of classes in the Q mixture model. AIC, AICc or Likelihood ratio test (LRT) are also available to assess the number of classes.
+BIC is the default criterion to assess the number of classes in the Q mixture model. AIC, AICc or likelihood ratio test (LRT) are also available to assess the number of classes.
 
 To use AIC:
 
 	iqtree -s example.phy -m MIX+MF -merit AIC
 
-To useLikelihood ratio test (LRT) with p-value = 0.05 to assess the number of classes:
+To use likelihood ratio test with p-value = 0.05 to assess the number of classes:
 
 	iqtree -s example.phy -m MIX+MF -lrt 0.05 
 
@@ -417,3 +417,4 @@ Please note that, in any MAST model with more than one substitution model (i.e.
 [Wang et al., 2008]: https://doi.org/10.1186/1471-2148-8-331
 
 
+