DOC: more cleanup of 1.3 release notes (#41954)
DOC: more cleanup of 1.3 release notes (#41954)

* DOC: more cleanup of 1.3 release notes

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