[Doc] Fix typo + python_package build location change

[jiangqucheng]

Based on the instructions above in Development.md, the build result of Python packages "torch_mlir", and "torch_mlir_e2e_test" didn't show up in pwd/build/python_packages/torch_mlir, but in another location that I added. I found this path has been changed quite often in recent commits. To keep safe, both paths are kept. I have tested, and adding both locations at the same time won't hurt. Also, change typo "tpython_packages", and add hyphens.

[dan-garvey]

I think we should probably fix the underlying problem in cmake that is causing the divergence of paths for different users. Can you two confirm the build command you use so we can triage? From what I understand, its an issue with out of tree llvm builds?