Update Learning-Environment-Create-New.md (#1993)

* Update Learning-Environment-Create-New.md

Section : Final Editor Setup - Step 3. It says:
Drag the Brain RollerBallPlayer from the Project window to the RollerAgent Brain field.

Should say:
Drag the Brain RollerBallBrain from the Project window to the RollerAgent Brain field.

* Develop black format fix (#1998)

* fixed the format

* changed the circleci config

* [Gym] Added no_graphics argument (#1997)

> Added the no_graphics argument to the gym interface. #1413

* [Documentation] SetReward method (#1996)

Added a paragraph in the docs/Learning-Environment-Design-Agents.md document regarding the use of SetReward and how it is different from AddReward

* [Documentation] Added information for the environments the trainer cannot train with the default configurations (#1995)

* Format gym_unity using black

docs/Learning-Environment-Create-New.md

     Brains to the **Broadcast Hub**.
 2. Select the **RollerAgent** GameObject to show its properties in the Inspector
     window.
-3. Drag the Brain **RollerBallPlayer** from the Project window to the 
+3. Drag the Brain **RollerBallBrain** from the Project window to the 
     RollerAgent **Brain** field.
 4. Change **Decision Interval** from `1` to `10`.
 5. Drag the Target GameObject from the Hierarchy window to the RollerAgent