Improved example

Author: ankane

README.md

@@ -43,7 +43,7 @@ Get the nearest neighbors
 Add an approximate index
 
 ```lisp
-(query (:create-index 'my-index :on 'items :using hnsw :fields embedding\ vector_l2_ops))
+(query (:create-index 'my-index :on 'items :using hnsw :fields "embedding vector_l2_ops"))
 ;; or
 (query "CREATE INDEX ON items USING ivfflat (embedding vector_l2_ops) WITH (lists = 100)")
 ```

postmodern.lisp

@@ -15,4 +15,4 @@
 (doquery (:limit (:order-by (:select 'id 'embedding :from 'items) (:<-> 'embedding "[1,1,1]")) 5) (id embedding)
     (format t "~A: ~A~%" id embedding))
 
-(query (:create-index 'my-index :on 'items :using hnsw :fields embedding\ vector_l2_ops))
+(query (:create-index 'my-index :on 'items :using hnsw :fields "embedding vector_l2_ops"))