DOC: update link to user guide (#39869)
DOC: update link to user guide (#39869)

* update link to user guide

* correct whitespace issue

* fix line break
dsm054/pandas,jorisvandenbossche/pandas,gfyoung/pandas,datapythonista/pandas,pandas-dev/pandas,datapythonista/pandas,dsm054/pandas,gfyoung/pandas,dsm054/pandas,rs2/pandas,gfyoung/pandas,jorisvandenbossche/pandas,jorisvandenbossche/pandas,gfyoung/pandas,pandas-dev/pandas,pandas-dev/pandas,gfyoung/pandas,dsm054/pandas,rs2/pandas,rs2/pandas,datapythonista/pandas,dsm054/pandas,rs2/pandas,pandas-dev/pandas,jorisvandenbossche/pandas,datapythonista/pandas