Incorporated the below review comment

-Repharase source code comment

Author: rajkan01

platform/source/mbed_sdk_boot.c

@@ -87,8 +87,8 @@ void _platform_post_stackheap_init(void)
     us_ticker_init();
 #endif
 }
-// The below resolves the missing variable warning while config with --keep command with os_cb_sections
-// Arm Compiler 6 version 6.12 and earlier versions are affected.
+//Define an empty os_cb_sections to remove a RTX warning when building with no RTOS due 
+//to the --keep=os_cb_sections linker option
 const uint32_t os_cb_sections[] __attribute__((section(".rodata"))) = {};
 
 #elif defined (__GNUC__)