Fix up docs (#477)

python/lancedb/embeddings/__init__.py

@@ -17,5 +17,6 @@ from .functions import (
     EmbeddingFunctionModel,
     EmbeddingFunctionRegistry,
     SentenceTransformerEmbeddingFunction,
+    TextEmbeddingFunctionModel,
 )
 from .utils import with_embeddings

python/lancedb/embeddings/functions.py

@@ -169,6 +169,10 @@ class TextEmbeddingFunctionModel(EmbeddingFunctionModel):
 
 @REGISTRY.register()
 class SentenceTransformerEmbeddingFunction(TextEmbeddingFunctionModel):
+    """
+    An embedding function that uses the sentence-transformers library
+    """
+
     name: str = "all-MiniLM-L6-v2"
     device: str = "cpu"
     normalize: bool = False