docs: add references to learning materials to websocket example (asyn…

…capi#542)

examples/2.0.0/websocket-gemini.yml

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-#This example showcases usage of AsyncAPI for the purpose of describing a WebSocket API. It is based on a real public service maintained by company called Gemini that provides cryptocurency trading products. It uses AsyncAPI bindings.
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-#This AsyncAPI document describes their v1 of the API. The v2 is also available and changes in the way that it provides a multimessage channel, where you subscribe for messages by sending a subscription message instead of using query parameters. For example with multimessage channel check out this article https://www.asyncapi.com/blog/websocket-part2 about another real public API called Kraken
+# This example showcases usage of AsyncAPI for the purpose of describing a WebSocket API. It is based on a real public service maintained by company called Gemini that provides cryptocurency trading products. It uses AsyncAPI bindings.
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+# This AsyncAPI document describes their v1 of the API. The v2 is also available and changes in the way that it provides a multimessage channel, where you subscribe for messages by sending a subscription message instead of using query parameters. For example with multimessage channel check out this article https://www.asyncapi.com/blog/websocket-part2 about another real public API called Kraken
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+# All available learning materials about AsyncAPI and WebSocket are:
+# - WebSocket, Shrek, and AsyncAPI - An Opinionated Intro article: https://www.asyncapi.com/blog/websocket-part1
+# - Creating AsyncAPI for WebSocket API - Step by Step article: https://www.asyncapi.com/blog/websocket-part2
+# - From API-First to Code Generation - A WebSocket Use Case article: https://www.asyncapi.com/blog/websocket-part3
+# - Live stream about topics mentioned in part 1 and 2 articles: https://www.youtube.com/watch?v=8tFBcf31e_c
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 asyncapi: 2.0.0