Mention explicitly that @EventListener should be put on public methods

[snicoll]

any method should rather be any public method in this section

[yezhiweier]

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[yangguang001]

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[hklisuper]

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[xmt1139057136]

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[sbrannen]

any method should rather be any public method in this section

This effectively reverts #26785.

Is there a requirement that such methods be public?

[snicoll]

I got confused by an external report, I'll have to get back to the user.