DOC clean up doc/source/getting_started/overview.rst (#35981)
DOC clean up doc/source/getting_started/overview.rst (#35981)

* improved the documentation

* Update doc/source/getting_started/overview.rst

Co-authored-by: Marco Gorelli <6ac6b2f721d9d72e96db4fbe8571ed09d0ad288d@gmail.com>

* new commit

* content changed

* new commit

Co-authored-by: Marco Gorelli <6ac6b2f721d9d72e96db4fbe8571ed09d0ad288d@gmail.com>
gfyoung/pandas,jreback/pandas,gfyoung/pandas,pandas-dev/pandas,dsm054/pandas,pandas-dev/pandas,datapythonista/pandas,dsm054/pandas,rs2/pandas,dsm054/pandas,gfyoung/pandas,jreback/pandas,rs2/pandas,jorisvandenbossche/pandas,gfyoung/pandas,jorisvandenbossche/pandas,dsm054/pandas,rs2/pandas,pandas-dev/pandas,rs2/pandas,jreback/pandas,dsm054/pandas,pandas-dev/pandas,gfyoung/pandas,jreback/pandas,jorisvandenbossche/pandas,jreback/pandas,datapythonista/pandas,datapythonista/pandas,datapythonista/pandas,jorisvandenbossche/pandas