DOC: clean v1.1.1 release notes (#35787)
DOC: clean v1.1.1 release notes (#35787)

Co-authored-by: Joris Van den Bossche <36c737f86d71d8ee1ddeb1e5c83102ee5de8f97c@gmail.com>
datapythonista/pandas,datapythonista/pandas,datapythonista/pandas,dsm054/pandas,gfyoung/pandas,jreback/pandas,jorisvandenbossche/pandas,jorisvandenbossche/pandas,rs2/pandas,jreback/pandas,datapythonista/pandas,pandas-dev/pandas,gfyoung/pandas,jreback/pandas,pandas-dev/pandas,pandas-dev/pandas,dsm054/pandas,gfyoung/pandas,dsm054/pandas,jreback/pandas,jorisvandenbossche/pandas,gfyoung/pandas,rs2/pandas,gfyoung/pandas,jreback/pandas,dsm054/pandas,dsm054/pandas,jorisvandenbossche/pandas,rs2/pandas,rs2/pandas,pandas-dev/pandas