Add op_use_default_grad_op_maker.spec approval (#19035)

* change grad_op approval

* test=develop

paddle/scripts/paddle_build.sh

@@ -519,8 +519,10 @@ function assert_api_spec_approvals() {
       if [ "${API_CHANGE}" ] && [ "${GIT_PR_ID}" != "" ]; then
           # NOTE: per_page=10000 should be ok for all cases, a PR review > 10000 is not human readable.
           # approval_user_list: XiaoguangHu01 46782768,chengduoZH 30176695,Xreki 12538138,luotao1 6836917,sneaxiy 32832641,tensor-tang 21351065,xsrobin 50069408,qingqing01 7845005,junjun315 3124479,shanyi15 35982308,guoshengCS 14105589,heavengate 12605721,kuke 3064195,Superjomn 328693,lanxianghit 47554610,cyj1986 39645414,hutuxian 11195205,frankwhzhang 20274488,nepeplwu 45024560,Dianhai 5086632. 
-          if [[ "${API_FILE}" == "paddle/fluid/API.spec" || "${API_FILE}" == "paddle/fluid/op_use_default_grad_op_maker.spec" ]];then
+          if [ "${API_FILE}" == "paddle/fluid/API.spec" ];then
             APPROVALS=`echo ${approval_line}|python ${PADDLE_ROOT}/tools/check_pr_approval.py 2 7534971 14105589 12605721 3064195 328693 47554610 39645414 11195205 20274488 45024560 ` 
+          elif [ "${API_FILE}" == "paddle/fluid/op_use_default_grad_op_maker.spec" ];then
+            APPROVALS=`echo ${approval_line}|python ${PADDLE_ROOT}/tools/check_pr_approval.py 1 32832641 6836917`
           elif [ "${API_FILE}" == "CMakeLists.txt" ];then
             APPROVALS=`echo ${approval_line}|python ${PADDLE_ROOT}/tools/check_pr_approval.py 1 6836917 46782768 30176695`
           elif [ "${API_FILE}" == "python/paddle/fluid/__init__.py" ];then
@@ -535,7 +537,7 @@ function assert_api_spec_approvals() {
             if [ "${API_FILE}" == "paddle/fluid/API.spec" ];then
               echo "You must have two RD (wanghaoshuang or guoshengCS or heavengate or kuke or Superjomn or lanxianghit or cyj1986 or hutuxian or frankwhzhang or nepeplwu) approval for the api change! ${API_FILE} for the management reason of API interface and API document."
             elif [ "${API_FILE}" == "paddle/fluid/op_use_default_grad_op_maker.spec" ];then
-              echo "You must have two RD (wanghaoshuang or guoshengCS or heavengate or kuke or Superjomn or lanxianghit or cyj1986 or hutuxian or frankwhzhang or nepeplwu) approval for the api change! ${API_FILE} for the management reason of grad_op."
+              echo "You must have sneaxiy approval for the api change! ${API_FILE} for the management of grad_op memory optimization."
             elif [ "${API_FILE}" == "CMakeLists.txt" ];then
               echo "You must have one RD (luotao1 or chengduoZH or XiaoguangHu01) approval for the cmakelist change! ${API_FILE} for the management reason of the Compilation parameter."
             elif [ "${API_FILE}" == "python/requirements.txt" ];then