docs: Fix ModuleNotFoundError: No module named 'asdl' #7669

Job	Run time
Build LPython to WASM	7m 10s
LPython CI (3.10, ubuntu-latest)	10m 35s
LPython CI (3.10, macos-latest)	7m 23s
Test CPython Interop (@pythoncall)	3m 2s
Check Debug build	3m 24s
Run Integration tests with Python 3.10	3m 12s
Run Integration tests with Python 3.11	3m 26s
Build Jupyter Kernel	4m 5s
LPython CI (3.10, windows-2025)	21m 35s
Upload Tarball	49s
Run Integration tests with Python 3.12	3m 29s
Test LLVM 10	3m 32s
Run Integration tests with Python 3.9	3m 24s
Test LLVM 15	3m 23s
Test LLVM 16	3m 26s
Test PIP Installable Packages	2m 57s
Check Release build	6m 51s
Run SymPy tests	4m 25s
	1h 36m 8s

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