Add description of += being used to subscribe to an event #9663
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BillWagner
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✨ 1st-time docs contributor!
BillWagner
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Dec 19, 2018
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Thanks for updating this and fixing the issue @simshaun We appreciate it.
I've reviewed the changes, and checked the build report. The links are correct. I like the added text, and I'll 
now.
Thanks again for making your first contribution to docs. 🎆
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Summary
Add a blurb about usage of +=.
Fixes #8371
Side-note: I hope I got the relative links correct.