chore(docs): sync up README from docarray

Signed-off-by: dev-bot@jina.ai <Jina Dev Bot>

Author: dev-bot@jina.ai

README.md

@@ -1,7 +1,7 @@
 <p align="center">
 <img src="https://github.com/docarray/docarray/blob/main/docs/_static/logo-light.svg?raw=true" alt="DocArray logo: The data structure for unstructured data" width="150px">
 <br>
-<b>The data structure for unstructured multimodal data</b>
+<b>The data structure for multimodal data</b>
 </p>
 
 <p align=center>