Doc: lines added

DOC: 
- [ ] [Tests added and passed](doc/source/getting_started/comparison/comparison_with_r.rst) 
- This addition helps readers understand the purpose of the page and the context of the comparison between pandas and the R language.
- Provide additional clarity to the sentence, making it explicit that the comparison is related to these specific aspects.

Please as noted before https://github.com/pandas-dev/pandas/pull/54840#issuecomment-1697128112, pull requests should reference existing issues