fix typo in pages/graphql-js/object-types.mdx

[askariali]

Description

This PR will fix a typo in the graphql-js/object-types page. The typo: die -> dice

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Thank you for the suggestion, but dice is a plural noun; the singular of dice is die (as in "the die was cast"), so a dice does not make grammatical sense.

https://www.merriam-webster.com/dictionary/die

[askariali]

@benjie Oh, thanks for clarifying