Update docs/reference/configuration/mbed_targets.md

Co-Authored-By: SenRamakri <[email protected]>

Author: iriark01

docs/reference/configuration/mbed_targets.md

@@ -206,7 +206,8 @@ When using `ARM`, `ARMC5`, `ARMC6` for `supported_toolchains`, please note:
 
 - It's invalid to use `-t ARMC5` with the `mbed compile` command for a target that specifies `ARMC6` for `supported_toolchains`, and it's invalid to use `-t ARMC6` if `supported_toolchains` specifies `ARMC5`.
 
-<span class="notes">**Note:** Arm Compiler 6 is the default Arm Compiler for Mbed OS development. Most Mbed OS platforms are already compatible with Arm Compiler 6. Some existing targets still supporting Arm Compiler 5 will be migrated to Arm Compiler 6 in the future. Please be aware that you must use Arm Compiler 6 for future development because Arm Compiler 5 support will be deprecated in September 2019.</span>
+<span class="notes">**Note**: Arm Compiler 6 is the default Arm Compiler version for Mbed OS development, and is [free for use with Mbed OS]((https://os.mbed.com/docs/mbed-os/development/tools/index.html#compiler-versions). Most platforms are already compatible with it; platforms still supporting Arm Compiler 5 will be migrated to Arm Compiler 6. Please do not use Arm Compiler 5 in any new development, as its support will be deprecated in September 2019.
+.</span>
 
 #### default_toolchain