fix(schema): Fix event type definitions page

[untitaker]

Broken in #181, replicated fix from #201

Script used to bisect (running http-server from npm in the background):

#!/bin/sh

yarn && yarn gatsby clean && yarn build || exit 125

set -e

/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --headless --disable-gpu --dump-dom http://localhost:8080/sdk/event-payloads/types/ | rg EventProcessingError

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