docs(bedrock_embedding): remove unsupported Marengo Embed 3.0 section

[devin-ai-integration]

Summary

docs/providers/bedrock_embedding.md (added in #1257) documented TwelveLabs Marengo Embed 3.0 (twelvelabs.marengo-embed-3-0-v1:0) as supported, including input_type="text_image" / "multi_input" with media_source / media_sources, inferenceId / bucketOwner passthrough, and 3.0-specific 400 rejection of 2.7-only params.

None of this exists in litellm main:

• litellm/types/llms/bedrock.py: TWELVELABS_EMBEDDING_INPUT_TYPES = Literal["text", "image", "video", "audio"]
• litellm/llms/bedrock/embed/twelvelabs_marengo_transformation.py: _transform_request only branches on those four input types; get_supported_openai_params has no media_source / media_sources / inferenceId, so passing them raises UnsupportedParamsError unless drop_params
• rg 'text_image|multi_input|media_sources|marengo-embed-3' litellm/ has no embedding matches; model_prices_and_context_window.json has no marengo-embed-3 entry

This PR removes the Marengo Embed 3.0 header link, async-invoke table row, input_type parenthetical, the whole ## TwelveLabs Marengo Embed 3.0 section, and the supported-models table row. The 2.7 docs are untouched.

Fixes LIT-7267
https://linear.app/litellm-ai/issue/LIT-7267/docs-providersbedrock-embeddingmd-lines-22-33-178-237-506-marengo

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Open in Devin Desktop: https://app.devin.ai/desktop/session/99f656d9e75848fbaa8e1de063ccec9b?variant=devin

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Project	Deployment	Actions	Updated
litellm	Ready	Preview	Sep 8, 2026 8:51pm UTC

[devin-ai-integration]

Live validation for LIT-7267 against litellm main (aa2219d466): this PR's premise no longer holds. Marengo Embed 3.0 landed in BerriAI/litellm on 2026-09-07 (dc09d9e7cf feat(bedrock): add TwelveLabs Marengo Embed 3.0 embeddings, module litellm/llms/bedrock/embed/twelvelabs_marengo_3_transformation.py, model id listed in litellm/constants.py), so the section this PR deletes describes shipped behavior

Proxy from source (uv run litellm --config ..., port 4011) with model: bedrock/us.twelvelabs.marengo-embed-3-0-v1:0, aws_region_name: us-east-1, real AWS credentials, no stubs. Every snippet from the section being removed works:

$ curl localhost:4011/v1/embeddings -d '{"model":"marengo-3","input":"a dog running on the beach","input_type":"text"}'
model=marengo-3 dims=512 first3=[-0.010009765625, -0.08544921875, 0.009033203125]

$ curl ... -d '{"model":"marengo-3","input":"a duck","input_type":"text_image","media_source":"<base64 256x256 png>"}'
model=marengo-3 dims=512 first3=[-0.05810546875, -0.04736328125, 0.018310546875]

$ curl ... -d '{"model":"marengo-3","input":"a photo of <@bird> on water","input_type":"multi_input","media_sources":{"bird":"<base64 png>"}}'
model=marengo-3 dims=512 first3=[-0.061767578125, -0.0771484375, 0.0859375]

The 400 behaviors the section documents also match the code:

$ curl ... -d '{"model":"marengo-3","input":"a duck","input_type":"text_image"}'
HTTP 400  BedrockException - Input type 'text_image' requires the 'media_source' parameter

$ curl ... -d '{"model":"marengo-3","input":"hi","input_type":"text","textTruncate":"end"}'
HTTP 400  BedrockException - Marengo 3.0 does not accept the Marengo 2.7 parameters textTruncate; set drop_params to drop them

For contrast, the same text_image request against bedrock/us.twelvelabs.marengo-embed-2-7-v1:0 is rejected by Bedrock (/inputType: does not have a value in the enumeration ["text", "image"]), which is exactly why the docs split 2.7 and 3.0

The PR was correct on 2026-09-08 when it was opened against the litellm main of that moment, but litellm main has since caught up with the docs. The PR also currently shows a merge conflict with docs main (main moved sk-1234 to placeholders in #1431). Recommendation: close without merging; the current docs/providers/bedrock_embedding.md Marengo 3.0 section is accurate