[Bug Report] MiniGrid-MultiRoom-N4-S5-v0 has wrong number of rooms

[Chocological45]

Describe the bug
MiniGrid-MultiRoom-N4-S5-v0 is configured to produce 6 rooms and not 4 as the documentation suggests

Code example
The kwargs for the following code needs to be adjusted to use minNumRooms = 4 and maxNumRooms = 4

register(
id="MiniGrid-MultiRoom-N4-S5-v0",
entry_point="minigrid.envs:MultiRoomEnv",
kwargs={"minNumRooms": 6, "maxNumRooms": 6, "maxRoomSize": 5},
)

System Info
Minigrid installed via pip
Ubuntu 22.04.5 LTS
Python 3.9.13

Additional context
None

Checklist

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