Update README

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

README.md

@@ -15,7 +15,8 @@ This operator is implemented with pre-trained models from [Huggingface Transform
 ## Code Example
 
 Use the pre-trained model "huggingface/CodeBERTa-small-v1"
-to generate text embeddings for given code "" and text description "".
+to generate text embeddings for given 
+text description "return max value" and code "def max(a,b): if a>b: return a else return b".
 
 *Write the pipeline*:
 
@@ -34,7 +35,7 @@ import towhee
 import towhee
 
 (
-    towhee.dc['text'](['find max value', 'def max(a,b): if a>b: return a else return b'])
+    towhee.dc['text'](['return max value', 'def max(a,b): if a>b: return a else return b'])
           .code_search.codebert['text', 'embedding']()
           .show()
 )