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1cc7d4c9 - Update SageMaker Endpoint Embeddings docs to be up to date with current requirements (#8103)

Update SageMaker Endpoint Embeddings docs to be up to date with current requirements (#8103) - **Description:** Simple change of the Class that ContentHandler inherits from. To create an object of type SagemakerEndpointEmbeddings, the property content_handler must be of type EmbeddingsContentHandler not ContentHandlerBase anymore, - **Twitter handle:** @Juanjo_Torres11 Co-authored-by: Bagatur <baskaryan@gmail.com>