DOC: Fix inaccurate statement in 1.2.0 release notes

[rs2]

Location of the documentation

https://pandas.pydata.org/docs/whatsnew/v1.2.0.html

Suggested fix for documentation

It would be more accurate for this line to reference #37983 (itself) as #27101 does not deal with the xarray upgrade, whereas #37983 does.

[bsun94]

Hi there, I'm still quite new to contributing to pandas, and I was wondering if help is still needed here?