[docs] Document the effect of the order of bind: and on:

[gtm-nayan]

Closes #6197

After reading the maitainers' views on #5166, I think a simple note like this would be sufficient.

on: and bind: have separate sections for components and elements but from a beginner's perspective this seems like the most natural place to have it.

I'm not sure what, if anything would need to be added in any of the tutorials, I'd appreciate some comments on that.

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