docs: fix docs build

[avik-pal]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @avik-pal, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to resolve issues with the documentation build process. It includes an update to the list of available neural network activation functions by adding 'gelu_sigmoid' and adjusts the configuration for the 'SimpleChains' tutorial, which is a common step to ensure the documentation compiles without errors.

Highlights

• Documentation Update: Added 'gelu_sigmoid' to the list of neural network activation functions in the 'ActivationFunctions.md' documentation file, ensuring the documentation is up-to-date with available functions.
• Tutorial Configuration Adjustment: Modified the 'tutorials.jl' file to change the 'SimpleChains' tutorial's configuration, specifically setting its third parameter from 'true' to 'false', likely to address a build issue or temporarily disable its execution during the documentation build process.

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[gemini-code-assist]

Code Review

This pull request aims to fix the documentation build. It does so by adding gelu_sigmoid to the list of activation functions and disabling the SimpleChains tutorial. My review includes a suggestion to improve the ordering of activation functions for better readability and a correction for the device type of the disabled tutorial. It would be beneficial to investigate the root cause of the SimpleChains tutorial failure and re-enable it in a future change.

[gemini-code-assist]

For better readability and maintainability, it would be good to keep the list of activation functions sorted alphabetically. The gelu variants seem to be out of order.

Suggested change

	gelu_tanh
	gelu_sigmoid
	gelu_erf
	gelu_erf
	gelu_sigmoid
	gelu_tanh

[gemini-code-assist]

The SimpleChains tutorial appears to be CPU-based, as indicated by Reactant.set_default_backend("cpu") in examples/SimpleChains/main.jl. It should be marked as "CPU" instead of "CUDA". While disabling it fixes the build for now, please correct the device type. It is also recommended to investigate why this tutorial is failing and re-enable it for the correct device (CPU) in a follow-up PR.

    ("SimpleChains",            "CPU",   false),