[Docs] Remove vestigial refernces to "mlflow sklearn" (mlflow#1359)

docs/source/models.rst

@@ -56,7 +56,7 @@ And its ``MLmodel`` file describes two flavors:
         loader_module: mlflow.sklearn
 
 This model can then be used with any tool that supports *either* the ``sklearn`` or
-``python_function`` model flavor. For example, the ``mlflow sklearn`` command can serve a
+``python_function`` model flavor. For example, the ``mlflow models serve`` command can serve a
 model with the ``sklearn`` flavor:
 
 .. code-block:: bash

docs/source/tutorial.rst

@@ -295,7 +295,7 @@ in MLflow saved the model as an artifact within the run.
 
       .. note::
 
-          The version of Python used to create the model must be the same as the one running ``mlflow sklearn``.
+          The version of Python used to create the model must be the same as the one running ``mlflow models serve``.
           If this is not the case, you may see the error
           ``UnicodeDecodeError: 'ascii' codec can't decode byte 0x9f in position 1: ordinal not in range(128)``
           or ``raise ValueError, "unsupported pickle protocol: %d"``.