docs(genai): Text Embedding Sample for Gen AI SDK

[holtskinner]

Description

https://cloud.google.com/vertex-ai/generative-ai/docs/embeddings/get-text-embeddings

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• genai/embeddings/embed_content_text.py:17, tag googlegenaisdk_embeddings_docretrieval_with_txt
• genai/embeddings/embeddings_docretrieval_with_txt.py:17, tag googlegenaisdk_embeddings_docretrieval_with_txt

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[msampathkumar]

LGTM. Kindly update the region tag before merging!