cmake readme: fix steps

Author: 0xc0170

cmake/README.md

@@ -33,6 +33,6 @@ Prerequisities:
 - mbed-tools >3.2.0
 
 From the application root run the following:
-1. To create Mbed OS configuration: `mbedtools configure -m target_name -t toolchain name`
-2. Run CMake to create the project files and build the project: `mkdir build && cd build && cmake .. -GNinja && cmake --build .`
+1. To create Mbed OS configuration: `mbedtools configure -m target_name -t toolchain_name`
+2. Run CMake to create the project files and build the project using Ninja: `mkdir build && cd build && cmake .. -GNinja && cmake --build .`