[DOC] Fix PYTHONPATH in "Install from Source"

[ruslo]

Since 'tvm-ffi' package is installed by 'pip install' in a separate step, there is no need to add '$TVM_HOME/ffi/python' to PYTHONPATH

[gemini-code-assist]

Summary of Changes

Hello @ruslo, 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 updates the "Install from Source" documentation to accurately reflect the current installation process. It specifically refines the PYTHONPATH setup instructions, removing an unnecessary path component, thereby streamlining the guide for users.

Highlights

• Documentation Update: Corrected the PYTHONPATH environment variable setting in the "Install from Source" guide by removing the $TVM_HOME/ffi/python entry.
• Installation Process: Aligned the PYTHONPATH instructions with the fact that the tvm-ffi package is now installed separately via pip install.

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Changelog

• docs/install/from_source.rst
  • Removed an unnecessary path component from the PYTHONPATH export command.

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[gemini-code-assist]

Code Review

This pull request updates the installation-from-source documentation by removing an obsolete path from the PYTHONPATH environment variable. The change correctly reflects that the tvm-ffi package is installed via pip and therefore does not need to be manually added to the PYTHONPATH. This is a good cleanup that improves the accuracy of the documentation. The change is correct and I approve it.