Update usage-guide.md

Spelling typo. Modified "sentence transfomer" to "sentence transformer"

Author: kishkath

docs/usage-guide.md

@@ -195,7 +195,7 @@ collection = client.get_collection(name="my_collection", embedding_function=emb_
 If you later wish to `get_collection`, you MUST do so with the embedding function you supplied while creating the collection
 :::
 
-The embedding function takes text as input, and performs tokenization and embedding. If no embedding function is supplied, Chroma will use [sentence transfomer](https://www.sbert.net/index.html) as a default.
+The embedding function takes text as input, and performs tokenization and embedding. If no embedding function is supplied, Chroma will use [sentence transformer](https://www.sbert.net/index.html) as a default.
 
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