[skip ci] Modify script description (#9337)

Signed-off-by: groot <yihua.mo@zilliz.com>

scripts/run_go_codecov.sh

@@ -7,6 +7,7 @@ set -e
 echo "mode: atomic" > ${FILE_COVERAGE_INFO}
 
 # run unittest
+echo "Running unittest under ./internal"
 for d in $(go list ./internal... | grep -v vendor); do
     go test -race -coverpkg=./... -coverprofile=profile.out -covermode=atomic "$d"
     if [ -f profile.out ]; then