Update Dockerfile

Author: QPod0

docker_core/Dockerfile

@@ -75,7 +75,7 @@ RUN source /opt/utils/script-utils.sh \
       && CUDA_VER=$(echo "${CUDA_VERSION:0:4}" | sed 's/\.//' ) \
       && V=$($(grep -q "11" <<< "${CUDA_VER}") && echo ".post${CUDA_VER}" || echo "" ) \
       && V=$(echo ${PADDLE}==${PADDLE_VER}${V}) && echo "to install paddle: ${V}" \
-      && pip instal pip==20.2.2 \
+      && pip install pip==20.2.2 \
       && pip install ${V} -f "https://www.paddlepaddle.org.cn/whl/linux/mkl/avx/stable.html" \
       && pip install -U pip \
     ) || echo "Skip paddle install" )