Update _docs/tutorials/core/first_application_rtos/index.md

Co-authored-by: Ralph Lange <ralph-lange@users.noreply.github.com>

Author: pablogs9

_docs/tutorials/core/first_application_rtos/index.md

@@ -53,7 +53,7 @@ The options available here are:
 
 Once the command is executed, a folder named `firmware` must be present in your workspace.
 
-***NOTE:** if you are targetting Zephyr RTOS make sure you have the latest version of CMake:*
+***NOTE:** if you are targetting Zephyr, make sure you have the latest version of CMake:*
 
 ```bash
 sudo apt install wget