update for the documentation

[abrin]

culling through our change logs to try and make sure we update the documentation where we changed things:

• world-ready event
• getContentState / setContentState
• changes to choice handling and event(s)

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Latest deployment of this branch, based on commit 99bbcfe8f8025193d7355efa35182b8999bbe729:

Sandbox	Source
simple-vue	Configuration
vue-3-carousel	Configuration
external-stylesheet-sandbox	Configuration
example-sandbox	Configuration
custom-preset	Configuration
react-choices-example	Configuration
reacting-to-the-user	Configuration
external-annotation-pages	Configuration
virtual-annotation-pages	Configuration
loading-annotation-pages	Configuration
annotation-display-1	Configuration
annotation-display-2	Configuration
choice-example	Configuration
choice-react	Configuration
more-regions-1	Configuration
more-regions-2	Configuration
regions-1	Configuration
regions-2	Configuration
regions-3	Configuration
regions-4	Configuration
regions-5	Configuration
regions-6	Configuration
responsive-1	Configuration

[abrin]

I think this one should be ready too