Modified str method of _bounding_box for clarity #76

Job	Run time
Continuous integration ubuntu-latest python 3.11	5m 21s
Continuous integration windows-latest python 3.9	7m 40s
Continuous integration ubuntu-latest python 3.9	5m 22s
Continuous integration windows-latest python 3.10	8m 32s
Continuous integration macos-latest python 3.11	5m 48s
Continuous integration macos-latest python 3.10	4m 21s
Continuous integration ubuntu-latest python 3.12	5m 34s
Continuous integration windows-latest python 3.12	7m 37s
Continuous integration ubuntu-latest python 3.10	5m 19s
Continuous integration macos-latest python 3.9	6m 17s
Continuous integration macos-latest python 3.12	5m 53s
Continuous integration windows-latest python 3.11	7m 34s
	1h 15m 18s

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