fixed the doc according to the issue

docs/Basic-Guide.md

 (**PC, Mac and Linux Standalone**, **iOS** or **Android**):
     1. Option the **Other Settings** section.
     2. Select **Scripting Runtime Version** to 
-    **Experimental (.NET 4.6 Equivalent)**
+    **Experimental (.NET 4.6 Equivalent or .NET 4.x Equivalent)**
     3. In **Scripting Defined Symbols**, add the flag `ENABLE_TENSORFLOW`. 
     After typing in the flag name, press Enter.
 6. Go to **File** > **Save Project**

docs/FAQ.md

 
 ### Scripting Runtime Environment not setup correctly
 
-If you haven't switched your scripting runtime version from .NET 3.5 to .NET 4.6, you will see such error message:
+If you haven't switched your scripting runtime version from .NET 3.5 to .NET 4.6 or .NET 4.x, you will see such error message:
 
 ```
 error CS1061: Type `System.Text.StringBuilder' does not contain a definition for `Clear' and no extension method `Clear' of type `System.Text.StringBuilder' could be found. Are you missing an assembly reference?

docs/Training-ML-Agents.md

 | batches_per_epoch | In imitation learning, the number of batches of training examples to collect before training the model.| BC |
 | beta | The strength of entropy regularization.| PPO, BC |
 | brain\_to\_imitate | For imitation learning, the name of the GameObject containing the Brain component to imitate. | BC |
-| buffer_size | The number of experiences to collect before updating the policy model. | PPO, BC |
+| buffer_size | The number of experiences to collect before updating the policy model. | PPO |
 | curiosity\_enc\_size | The size of the encoding to use in the forward and inverse models in the Curioity module. | PPO |
 | curiosity_strength | Magnitude of intrinsic reward generated by Intrinsic Curiosity Module. | PPO |
 | epsilon | Influences how rapidly the policy can evolve during training.| PPO, BC |