Fix test

Author: curquiza

spec/meilisearch/index/search/similar_spec.rb

@@ -46,7 +46,7 @@
 
     new_index.add_documents(documents).await
 
-    response = new_index.search_similar_documents('287947', embedders: 'manual')
+    response = new_index.search_similar_documents('287947', embedder: 'manual')
 
     expect(response['hits']).not_to be_empty
     expect(response['estimatedTotalHits']).not_to be_nil