Misc readme update

Pengfei Qu · Pengfei Qu · commit f7d114d3dc14 · 2019-10-08T09:53:06.000+08:00
diff --git a/doc/cmake.md b/doc/cmake.md
@@ -1,6 +1,6 @@
 
 Use the following definitions to customize the building process:
-- **PLATFORM**: Specify the target platform. Currently the supported platform is ```Xeon``` and ```VCAC-A```.
+- **PLATFORM**: Specify the target platform. Currently the supported platform are ```Xeon``` and ```VCAC-A```.
 
 ### Examples:
 
