fix: Add "boolean" and "symbol" types for "key" attribute. #2614
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Booleans as keys are supported since v2.4.2(commit) and symbols since v2.5.12(commit).
I created PR as suggested here. I think it now makes clear that this types are supported and not just "happens to work by accident".
I noticed that v-for has "since version" in type so I did the same.