Update example code for embedding dependency moving to 3rd_party (#1368)

Signed-off-by: lvliang-intel <liang1.lv@intel.com>

CodeTrans/docker_image_build/build.yaml

@@ -26,6 +26,6 @@ services:
   nginx:
     build:
       context: GenAIComps
-      dockerfile: comps/3rd_parties/nginx/src/Dockerfile
+      dockerfile: comps/third_parties/nginx/src/Dockerfile
     extends: codetrans
     image: ${REGISTRY:-opea}/nginx:${TAG:-latest}