In response to comments from Luo Tao

doc/howto/dev/build_cn.md

@@ -71,7 +71,7 @@
 
 - 学习 Docker 有多难？
 
-  理解 Docker 并不难，大概花十分钟看一遍 https://zhuanlan.zhihu.com/p/19902938 即可。这可以帮您省掉花一小时安装和配置各种开发工具，以及切换机器时需要新安装的辛苦。别忘了 PaddlePaddle 更新可能导致需要新的开发工具。更别提简化问题复现带来的好处了。
+  理解 Docker 并不难，大概花十分钟看一下[这篇文章](https://zhuanlan.zhihu.com/p/19902938)。这可以帮您省掉花一小时安装和配置各种开发工具，以及切换机器时需要新安装的辛苦。别忘了 PaddlePaddle 更新可能导致需要新的开发工具。更别提简化问题复现带来的好处了。
 
 - Docker 需要 sudo
 
@@ -93,8 +93,8 @@
 
 - 可以并行编译吗？
 
-  是的。我们的 Docker image 运行一个 Bash 脚本 https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/scripts/docker/build.sh 。这个脚本调用 `make -j$(nproc)` 来启动和 CPU 核一样多的进程来并行编译。
+  是的。我们的 Docker image 运行一个 [Bash 脚本](https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/scripts/docker/build.sh)。这个脚本调用 `make -j$(nproc)` 来启动和 CPU 核一样多的进程来并行编译。
 
 - Docker on Windows/MacOS？
 
-  Docker 在 Windows 和 MacOS 都可以运行。不过实际上是运行在一个 Linux 虚拟机上。可能需要注意给这个虚拟机多分配一些 CPU 和内存，以保证编译高效。具体做法请参考 https://github.com/PaddlePaddle/Paddle/issues/627 。
+  Docker 在 Windows 和 MacOS 都可以运行。不过实际上是运行在一个 Linux 虚拟机上。可能需要注意给这个虚拟机多分配一些 CPU 和内存，以保证编译高效。具体做法请参考[这个issue](https://github.com/PaddlePaddle/Paddle/issues/627)。

doc/howto/dev/build_en.md

@@ -71,7 +71,7 @@ Nothing else.  Not even Python and GCC, because you can install all build tools
 
 - How difficult is it to learn Docker?
 
-  It takes you ten minutes to read https://docs.docker.com/get-started/ and saves you more than one hour to install all required build tools, configure them, and upgrade them when new versions of PaddlePaddle require some new tools.
+  It takes you ten minutes to read [an introductory article](https://docs.docker.com/get-started) and saves you more than one hour to install all required build tools, configure them, and upgrade them when new versions of PaddlePaddle require some new tools.
 
 - Docker requires sudo
 
@@ -93,8 +93,8 @@ Nothing else.  Not even Python and GCC, because you can install all build tools
 
 - Does Docker do parallel building?
 
-  Our building Docker image runs a Bash script https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/scripts/docker/build.sh, which calls `make -j$(nproc)` to starts as many processes as the number of your processors.
+  Our building Docker image runs a [Bash script](https://github.com/PaddlePaddle/Paddle/blob/develop/paddle/scripts/docker/build.sh), which calls `make -j$(nproc)` to starts as many processes as the number of your processors.
 
 - Docker on Windows/MacOS?
 
-  On Windows and MacOS, Docker containers run in a Linux VM.  You might want to give this VM some more memory and CPUs so to make the building efficient.  Please refer to https://github.com/PaddlePaddle/Paddle/issues/627 for details.
+  On Windows and MacOS, Docker containers run in a Linux VM.  You might want to give this VM some more memory and CPUs so to make the building efficient.  Please refer to [this issue](https://github.com/PaddlePaddle/Paddle/issues/627) for details.