Documentation about ``directlist`` syntax is out-of-data

[tangxifan]

Describe the bug A clear and concise description of what the bug is.

• [x] Documentation

To Reproduce Steps to reproduce the behavior:

1. Clone OpenFPGA repository and checkout commit id: 6d6849d
2. Visit the documentation page: https://github.com/lnis-uofu/OpenFPGA/blob/6d6849dad7ce588889698dcf7519bc6ab80cac6b/docs/source/manual/arch_lang/direct_interconnect.rst
3. The syntax interconnection_type, x_dir, y_dir is now available in the OpenFPGA architecture XML, but NOT in the VPP architecture XML

Expected behavior Documentation should be consistent with the actual XML syntax

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Enviornment (please complete the following information):

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• Version:

• [x] Current master