Invalid syntax for workflow pull_request_target event example

[tomjschuster]

What article on docs.github.com is affected?

https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows

What part(s) of the article would you like to see updated?

pull_request_target example has a YAML syntax error due to a missing colon.

Docs: 👇

Syntax Error: 👇

Additional information

PR: #1890

[welcome]

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