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
319985789,MDExOlB1bGxSZXF1ZXN0MTg1NzY2MTg3,2101,DOC: Add resample e.g. Edit rolling e.g. Add groupby e.g.,17162724,closed,0,,,4,2018-05-03T16:08:48Z,2018-05-08T15:46:17Z,2018-05-08T04:23:03Z,CONTRIBUTOR,,0,pydata/xarray/pulls/2101," - [NA] Closes #xxxx (remove if there is no corresponding issue, which should only be the case for minor changes)
 - [NA] Tests added (for all bug fixes or enhancements)
 - [NA] Tests passed (for all non-documentation changes)
 - [NA] Fully documented, including `whats-new.rst` for all changes and `api.rst` for new API (remove if this change should not be visible to users, e.g., if it is an internal clean-up, or if this is part of a larger project that will be documented later)

Added a `resample` example to reflect the `DeprecationWarning: 
.resample() has been modified to defer calculations. Instead of passing 'dim' and 'how=""mean"", instead consider using...`. There were also some missing parameters in the docs.

Made a minor edit to my `rolling` example which uses the parameter `center`. I can't remember if that parameter was there last time but I think it's useful to return the time value for the middle of window.

Added a `groupby` example. Not sure if this should go here. See text below for my motivation of putting an example in the docstring of the class/object.

I learnt `xarray` before I learnt `pandas` so these example will hopefully be useful to other beginners as it took me a minute to get the syntax right.

Whilst there are great examples of these functions in the docs, a google search of a function for example `xarray rolling` often returns the doc entry that that object. Having a little example there is helpful for me to get the syntax right. The key/value pair in a dictionary for example is very powerful and always takes me a few tries to get the entry right.","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/2101/reactions"", ""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull