DOC: show how to combine `ReactionInfo` objects #315

Job	Run time
pytest / Determine job matrix	4s
pytest / Determine job matrix	6s
style / Determine skipped pre-commit hooks	38s
style / Determine skipped pre-commit hooks	10s
doc / nb / Execute and build documentation	49s
doc / nb / Execute and build documentation	2m 52s
doc / linkcheck / Check external links	1s
doc / linkcheck / Check external links	1m 12s
pytest / Run unit tests	0s
style / Run taplo through pre-commit	0s
style / Run taplo through pre-commit	21s
style / Run local pre-commit hooks	0s
style / Run local pre-commit hooks	57s
style / Push changes	46s
style / Push changes	0s
doc / Upload to GitHub Pages	0s
doc / Upload to GitHub Pages	0s
pytest / Run unit tests (3.10, ubuntu-22.04)	1m 44s
pytest / Run unit tests (3.11, ubuntu-22.04)	1m 28s
pytest / Run unit tests (3.7, ubuntu-22.04)	1m 54s
pytest / Run unit tests (3.9, ubuntu-22.04)	1m 47s
pytest / Run unit tests (3.6, ubuntu-20.04)	1m 50s
pytest / Run unit tests (3.8, ubuntu-22.04, qrules)	4m 34s
pytest / Run unit tests (3.9, macos-12)	2m 8s
	23m 21s

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