Update CI-Coverage check build size words (#41000)

paddle/scripts/paddle_build.sh

@@ -2952,7 +2952,7 @@ function check_coverage_build() {
        echo "current pr ${GIT_PR_ID} got approvals: ${APPROVALS}"
        if [ "${APPROVALS}" == "FALSE" ]; then
            echo "=========================================================================================="
-           echo "This PR make the release paddlepaddle coverage build size growth exceeds 3 G, please explain why your PR exceeds 3G to ext_ppee@baidu.com."
+           echo "This PR make the release paddlepaddle coverage build size growth exceeds 3 G, please explain why your PR exceeds 3G to ext_ppee@baidu.com and in PR description."
            echo "Then you must have one RD (tianshuo78520a (Recommend) or luotao1 or phlrain) approval for this PR\n"
            echo "=========================================================================================="
            exit 6