tweak the names of descriptors for grammatic consistency

Author: ablaom

src/model_traits.jl

@@ -174,19 +174,19 @@ descriptors() = [
     :classification,
     :clustering,
     :gradient_descent,
-    :iterative_model,
-    :incremental_model,
+    :iterative_models,
+    :incremental_models,
     :dimension_reduction,
-    :transformer,
-    :static_transformer,
-    :missing_value_imputer,
-    :ensemble_model,
-    :wrapper,
-    :time_series_forecaster,
-    :time_series_classifier,
+    :encoders,
+    :static_models,
+    :missing_value_imputation,
+    :ensemble_models,
+    :wrappers,
+    :time_series_forecasting,
+    :time_series_classification,
     :survival_analysis,
-    :distribution_fitter,
-    :Bayesian_model,
+    :distribution_fitters,
+    :Bayesian_models,
     :outlier_detection,
     :collaborative_filtering,
     :text_analysis,