Update docstrings of MaskRCNN

[hmk114]

The original docstring of MaskRCNN class says the returned mask is a UInt8Tensor in inference mode, which is not true. This can be verified by the following code:

import torch
from torchvision.models.detection import maskrcnn_resnet50_fpn_v2

model = maskrcnn_resnet50_fpn_v2()
model.eval()

with torch.no_grad():
    output = model([torch.randn(3, 100, 100)])

print(output[0]["masks"].dtype) # torch.float32

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[NicolasHug]

Thanks @hmk114

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