This issue has nearly no effect on users, but (at least for me) it is quite bothering aesthetically. It also looks like something simple to solve even though I am not an sphinx expert so I am not sure.

In the docstring, there is a colon between the name of one argument and its type, however, in the online documentation, the name and the type are smashed together. In the case of xr.align:

I think it would be more readable and appealing if there was some kind of separation between the two.