Added various activation function nodes and chained model node.

docs/reference/pt_apply_function.md

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+# Pt Apply Function
+Applies a function to the input tensor.
+
+### Fields:  
+- tens: Tensor to which the function be applied.
+- closure: Differentiable function to apply to the tensor.
+
+## Input
+| Name | Data type |
+|---|---|
+| tens | Tensor |
+| closure | Ptcallable |
+
+## Output
+| Data type |
+|---|
+| Tensor |
+
+<HR>
+Category: PyTorch wrapper - Training
+
+ComfyUI Pt Wrapper Node Reference. © 2025 Hide Inada (HowToSD.com). All rights reserved.