Allow AI Characters access certain training docs

🥳 GREAT NEWS: Train AI Characters with your custom data on http://custom.typingmind.com! Simply:

Add tags to your training docs
Assign these tags to certain AI characters so it can access certain training docs linked with that tags.

This allows you to: 🤖 Make use of AI characters to build multiple chatbots 💻 Easily control user access to each chatbot

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