[Docs] Document of RReLU about its different behavior between training and evaluation (#95624)
Current document of [Randomized Leaky ReLU (RReLU)](https://pytorch.org/docs/stable/generated/torch.nn.RReLU.html#torch.nn.RReLU) does not demonstrate its different behavior between training and evaluation. This PR adds illustrations about this.
Fixes #95605.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/95624
Approved by: https://github.com/albanD, https://github.com/H-Huang
