Make embedding name consistent (#8565)

CHANGELOG.md

docs/examples/embeddings/elasticsearch.ipynb

docs/examples/embeddings/jina_embeddings.ipynb

docs/examples/embeddings/llm_rails.ipynb

docs/examples/llm/huggingface.ipynb

llama_index/embeddings/__init__.py

llama_index/embeddings/elasticsearch.py

llama_index/embeddings/huggingface.py

llama_index/embeddings/llm_rails.py

tests/embeddings/test_elasticsearch.py

tests/embeddings/test_huggingface.py

tests/embeddings/test_llm_rails.py