DOC: Change "Convention for examples" to use Series name as `ser` instead of `s`

[DeaMariaLeon]

Pandas version checks

• I have checked that the issue still exists on the latest versions of the docs on main here

Location of the documentation

https://pandas.pydata.org/docs/dev/development/contributing_docstring.html#conventions-for-the-examples

Documentation problem

There's a general preference to use ser = instead of s = in examples

Per @MarcoGorelli

Suggested fix for documentation

Change s to ser on paragraph:

"When illustrating examples with a single Series use the name s, and if illustrating with a single DataFrame use the name df. For indices, idx is the preferred name. If a set of homogeneous Series or DataFrame is used, name them s1, s2, s3"

[MarcoGorelli]

thanks - yeah I've seen people request non-single-letter-variables in reviews, but the docstring guide still advises to use them - looks like the preference changed but nobody codified it. Would be good to change it

[topper-123]

+1

[austinburnett]

Hello! I'd be happy to work on this issue.

[DeaMariaLeon]

Hi @austinburnett ! Great, please go ahead.

[austinburnett]

Hey @DeaMariaLeon @MarcoGorelli I believed I finished up the issue! #53312

[shreevaths1]

First time contribution to open source. Please guide me as to what is the first step I can take

[DeaMariaLeon]

@austinburnett we commented there, thanks.

@shreevaths1 : This issue is taken. But you can take a look at https://pandas.pydata.org/docs/development/contributing.html#where-to-start