Example doc update

[jetfuel]

Doc

• Reveal the Text and Audio documentations. They were hidden before the 1.0.0 release

Embedding

• Update the Embedding add record function. It will take word_dict as that's the most nature way to create embedding.
• Include an example program to demonstrate how to use embedding visualization.
• TODO: Create a tutorial on how to the embedding: Documentation: How to use Embedding  #436