Fixed output location of generated single doc

[WillAyd]

Think this was pointing to the wrong location

[datapythonista]

Originally the file it was expected to be moved from generated_single to generated if I'm not wrong. If it's left there lets just change it here. But can you please update source/pandas_pr.rst instead of the html directly? Otherwise the changes will get lost next time we build the doc.

Thanks!

[WillAyd]

Not sure what I was looking at there - source file updated in last commit.

Unless there's a mistake, it looks like the copy goes from generated to generated_single and not the other way around, hence the proposed update here