docs(python): Add "See Also" for arg_sort and arg_sort_by

[rob-sil]

Related to #15316.

I think that arg_sort and arg_sort_by can be a bit confusing in polars, since polars doesn't use much indexing. It might help the docs to link to a related gather method (to use arg_sort results) or a related rank method (which people might want instead of arg_sort).

I kept the "See Also" descriptions in line with the method's documentation, but they could reference arg_sort/arg_sort_by instead.

[codecov]

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@@            Coverage Diff             @@
##             main   #15348      +/-   ##
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+ Coverage   81.36%   81.37%   +0.01%     
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  Lines      176615   176803     +188     
  Branches     2526     2531       +5     
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- Misses      32435    32442       +7     
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[stinodego]

Good move adding the See Also - I can see how these functions are related.

[stinodego]

This honestly doesn't clear anything up for me. I think it should be left out.

Perhaps we can use the code examples to make things a bit clearer, e.g. use a gather with the output of arg_sort and show that it's sorted?

[stinodego]

Looks good, thanks!