bugfix: missing import statements to help smooth over the workshop experience (#28)

Author: sasvdw

docs/sections/06-chat-api.md

@@ -187,6 +187,8 @@ import dev.langchain4j.model.embedding.EmbeddingModel;
 import dev.langchain4j.model.output.Response;
 import dev.langchain4j.store.embedding.EmbeddingMatch;
 import dev.langchain4j.store.embedding.EmbeddingStore;
+import dev.langchain4j.store.embedding.EmbeddingSearchRequest;
+import dev.langchain4j.store.embedding.EmbeddingSearchResult;
 import jakarta.inject.Inject;
 import jakarta.ws.rs.*;
 import org.slf4j.Logger;