Update ARM compiler to 5.06 Update 6

Author: Deepika Bhavnani

docs/tools/toolchains/export_to_third_party.md

@@ -6,16 +6,16 @@ If you'd like to develop on Arm Mbed OS with a third party tool, or migrate to o
 - IAR Systems.
 - Eclipse CDT ([C/C++ Development Tooling](https://www.eclipse.org/cdt/)) make (unmanaged) projects using:
     - GNU Arm Embedded Toolchain 6 (6-2017-q1-update).
-    - Arm Compiler 5.
+    - Arm Compiler 5.06 Update 6.
     - IAR Arm Compiler (version 8.32).
 - GNU Arm Eclipse (managed [CDT](https://www.eclipse.org/cdt/) projects), using GNU Arm Embedded Toolchain 6.
 - Make using:
     - GNU Arm Embedded Toolchain 6 (6-2017-q1-update).
-    - Arm Compiler 5.
+    - Arm Compiler 5.06 Update 6.
     - IAR Arm Compiler (version 8.32).
 - VSCode using:
     - GNU Arm Embedded Toolchain 6 (6-2017-q1-update).
-    - Arm Compiler 5.
+    - Arm Compiler 5.06 Update 6.
     - IAR Arm Compiler (version 8.32).
 - Code::Blocks.
 - Cross Core Embedded Studio.