DOC: user guide compat with osmnx 2.0

[martinfleis]

They renamed one level of the multiindex. This seems to be the only place where we explicitly drop that one. The rest is probably going to work fine.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.1%. Comparing base (4037c70) to head (a45c836). Report is 96 commits behind head on main.

Additional details and impacted files

[](https://app.codecov.io/gh/pysal/momepy/pull/669?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal) ```diff @@ Coverage Diff @@ ## main #669 +/- ## ======================================= + Coverage 97.4% 98.1% +0.8% ======================================= Files 26 40 +14 Lines 4328 7206 +2878 ======================================= + Hits 4214 7072 +2858 - Misses 114 134 +20 ``` [see 1 file with indirect coverage changes](https://app.codecov.io/gh/pysal/momepy/pull/669/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pysal)

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