docs: fix broken link (#38178)

Signed-off-by: zirain <[email protected]>
Signed-off-by: Ryan Northey <[email protected]>

Author: zirain

docs/root/configuration/http/http_filters/lua_filter.rst

@@ -278,7 +278,7 @@ Or, through ``bodyChunks()`` API, which let Envoy to skip buffering the upstream
 Complete example
 ----------------
 
-A complete example using Docker is available in :repo:`/examples/lua`.
+A complete example using Docker is available in `here <https://github.com/envoyproxy/examples/tree/main/lua>`__.
 
 Stream handle API
 -----------------