Fixing tensorboard command line params (#4262)

* Update Using-Tensorboard.md

"--logdir=results" is broken in newer versions of tensor board; "logdir results" without the equal sign works. See https://github.com/tensorflow/tensorboard/issues/686

* Removing equal sign from tensorboard command line params in docs

Co-authored-by: Nancy Iskander <nancyiskanderonline@gmail.com>

docs/Getting-Started.md

 TensorBoard. From the command line run:
 
 ```sh
-tensorboard --logdir=results
+tensorboard --logdir results
 ```
 
 Then navigate to `localhost:6006` in your browser to view the TensorBoard

docs/Training-on-Microsoft-Azure.md

 2. Unless you started the training as a background process, connect to your VM
    from another terminal instance.
 3. Run the following command from your terminal
-   `tensorboard --logdir=summaries --host 0.0.0.0`
+   `tensorboard --logdir results --host 0.0.0.0`
 4. You should now be able to open a browser and navigate to
    `<Your_VM_IP_Address>:6060` to view the TensorBoard report.
 

docs/Using-Docker.md

 http://localhost:6006:
 
 ```sh
-docker exec -it <container-name> tensorboard --logdir=/unity-volume/summaries --host=0.0.0.0
+docker exec -it <container-name> tensorboard --logdir /unity-volume/results --host 0.0.0.0
-docker exec -it 3DBallContainer.first.trial tensorboard --logdir=/unity-volume/summaries --host=0.0.0.0
+docker exec -it 3DBallContainer.first.trial tensorboard --logdir /unity-volume/results --host 0.0.0.0
 ```
 
 For more details on Tensorboard, check out the documentation about

docs/Using-Tensorboard.md

 
 1. Open a terminal or console window:
 1. Navigate to the directory where the ML-Agents Toolkit is installed.
-1. From the command line run: `tensorboard --logdir=results --port=6006`
+1. From the command line run: `tensorboard --logdir results --port 6006`
 1. Open a browser window and navigate to
    [localhost:6006](http://localhost:6006).
 

docs/localized/zh-CN/docs/Getting-Started-with-Balance-Ball.md

 ### 观测训练进度
 
 开始使用 `learn.py` 按照前面部分所述的方式进行训练后，`ml-agents` 文件夹将
-包含一个 `summaries` 目录。为了更详细地观测训练过程，
+包含一个 `results` 目录。为了更详细地观测训练过程，
-`tensorboard --logdir=summaries`
+`tensorboard --logdir results`
 
 然后导航至 `localhost:6006`。