Addon-info: add keys for separator spans in OneOfType

[Hypnosphi]

Fixes #2649

[codecov]

Codecov Report

Merging #2743 into master will decrease coverage by <.01%.
The diff coverage is 80%.

@@            Coverage Diff             @@
##           master    #2743      +/-   ##
==========================================
- Coverage   33.02%   33.01%   -0.01%     
==========================================
  Files         419      419              
  Lines        9158     9160       +2     
  Branches      971      982      +11     
==========================================
  Hits         3024     3024              
+ Misses       5485     5462      -23     
- Partials      649      674      +25

Impacted Files	Coverage Δ
addons/info/src/components/types/OneOfType.js	57.14% <80%> (-6.02%)	⬇️
app/vue/src/server/config/babel.js	0% <0%> (-100%)	⬇️
addons/actions/src/lib/util/typeReplacer.js	54.54% <0%> (ø)	⬆️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
lib/core/src/client/preview/story_store.js	52.88% <0%> (ø)	⬆️
lib/ui/src/modules/api/actions/api.js	51.85% <0%> (ø)	⬆️
addons/actions/src/lib/types/symbol/index.js	81.25% <0%> (ø)	⬆️
lib/ui/src/modules/api/configs/init_api.js	40.42% <0%> (ø)	⬆️
addons/knobs/src/components/types/Number.js	7.93% <0%> (ø)	⬆️
... and 49 more

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