New links to Arm Compiler 6

Author: iriark01

docs/reference/configuration/mbed_targets.md

@@ -206,8 +206,7 @@ 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 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>
+<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](../tools/after-installation-configuring-mbed-cli.html#using-arm-compiler-6-from-mbed-studio). 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
 

docs/tools/tools_intro.md

@@ -46,8 +46,7 @@ The Mbed Online Compiler is our in-house IDE and should be familiar to anyone wh
 | Arm v7A       | `Arm Compiler 6.11` |
 | Arm v8M       | `Arm Compiler 6.11` |
 
-<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>
+<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](../tools/after-installation-configuring-mbed-cli.html#using-arm-compiler-6-from-mbed-studio). 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>
 
 For more information, please see the [Online Compiler page](developing-mbed-online-compiler.html).