Add note on .sync camelCasing in documentation

[robertjk]

What problem does this feature solve?

The problem is that the documentation on Custom Events: Event Names states:

we recommend you always use kebab-case for event names.

With .sync modifier you must emit event update:propertyName with propertyName camelCased. With kebab-case it won't work. So it's not always: more like always unless you emit event for .sync.

What does the proposed API look like?

You should add a note about that in Custom Events: Event Names.

Also in the documentation Custom Events: .sync modifier I would change the example to use a property with multiple word name (now it's a single word title, which doesn't help with this problem) and/or add a note about this event name incosistency with previous recommendation on the same page ("always use kebab case").

[LinusBorg]

Sorry, this is still the wrong repository.

You are looking for this one:

https://github.com/vuejs/vuejs.org