id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1422869912,PR_kwDOAMm_X85BhYOh,7219,Explicitly remove grids for pcolormesh,14371165,closed,0,,,0,2022-10-25T18:04:14Z,2022-10-28T16:22:53Z,2022-10-28T16:22:53Z,MEMBER,,0,pydata/xarray/pulls/7219,"Removes a warning in the plotting tests, related to https://matplotlib.org/stable/api/prev_api_changes/api_changes_3.5.0.html#auto-removal-of-grids-by-pcolor-and-pcolormesh.

I just added `ax.grid(False)` but maybe we just want whatever is the default of matplotlib?

```python
import xarray as xr

airtemps = xr.tutorial.open_dataset(""air_temperature"")
air = airtemps.air - 273.15
air.attrs = airtemps.air.attrs
air.attrs[""units""] = ""deg C""

air2d = air.isel(time=500)
fig, axs = plt.subplots(2,1)
air2d.plot(ax=axs[0])  # No grid.
air2d.plot(ax=axs[1])  # With grid.
axs[1].grid(True)
```

![image](https://user-images.githubusercontent.com/14371165/197848951-01834aba-a260-4793-aa66-85288875498d.png)

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1422864082,PR_kwDOAMm_X85BhW94,7218,Rename FacetGrid.axes to FacetGrid.axs in tests,14371165,closed,0,,,1,2022-10-25T17:59:39Z,2022-10-27T17:45:20Z,2022-10-27T17:45:19Z,MEMBER,,0,pydata/xarray/pulls/7218,"Follow up to #7194. This fixes all the warnings related to the change.
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