Update README.md

bsp/raspi2/README.md

-|# Raspberry A7板级支持包说明
+# Raspberry A7板级支持包说明
 
 ## 1. 简介
 
@@ -89,7 +89,6 @@ msh >
 
 ```
 
-
 ## 4. 支持情况
 
 | 驱动 | 支持情况  |  备注  |
@@ -102,7 +101,6 @@ msh >
 
   [1]: https://www.rt-thread.org/page/download.html
   [2]: https://launchpad.net/gcc-arm-embedded/4.8/4.8-2014-q1-update/+download/gcc-arm-none-eabi-4_8-2014q1-20140314-linux.tar.bz2
-
   [3]: https://downloads.raspberrypi.org/raspbian_lite_latest
   [4]: https://etcher.io
-  [5:] https://github.com/BernardXiong
+  [5]: https://github.com/BernardXiong