DOC: Improve convert_dtypes's docstring (#58558) #41

Job	Run time
Test Conda Forge Recipe - Python 3.10	4m 24s
Test Conda Forge Recipe - Python 3.11	4m 12s
Test Conda Forge Recipe - Python 3.9	4m 26s
Install Extras - all	4m 10s
Install Extras - aws	4m 25s
Install Extras - clipboard	4m 16s
Install Extras - compression	4m 11s
Install Extras - computation	4m 3s
Install Extras - excel	4m 15s
Install Extras - feather	4m 17s
Install Extras - fss	4m 9s
Install Extras - gcp	4m 14s
Install Extras - hdf5	4m 15s
Install Extras - html	4m 11s
Install Extras - mysql	4m 14s
Install Extras - output-formatting	4m 16s
Install Extras - parquet	4m 13s
Install Extras - performance	4m 29s
Install Extras - plot	4m 17s
Install Extras - postgresql	4m 18s
Install Extras - pyarrow	4m 16s
Install Extras - spss	4m 5s
Install Extras - sql-other	4m 16s
Install Extras - test	4m 29s
Install Extras - xml	4m 9s
	1h 46m 30s

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