[MINOR] fix(docs): Fix the wrong link in the README.md (#1130)

### What changes were proposed in this pull request?
Fix the wrong link in the `README.md`

### Why are the changes needed?
If we don't have this pr,  It will report an error if we click the lick

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
I click the link locally.

Co-authored-by: qqqttt123 <148952220+qqqttt123@users.noreply.github.com>
Co-authored-by: Heng Qin <qqtt@123.com>

README.md

@@ -81,7 +81,7 @@ To stop the Gravitino server, please run:
 
 ### Using Trino with Gravitino
 
-Gravitino provides a Trino connector to access the metadata in Gravitino. To use Trino with Gravitino, please follow the [trino-gravitino-connector doc](docs/trino-gravitino-connector.md).
+Gravitino provides a Trino connector to access the metadata in Gravitino. To use Trino with Gravitino, please follow the [trino-gravitino-connector doc](docs/trino-connector/index.md).
 
 ## Development guide