Update tools intro section to capture new requirements for ARMC6 tranisition

Author: SenRamakri

docs/tools/tools_intro.md

@@ -27,18 +27,19 @@ Mbed OS 5 can be built with various toolchains. The currently supported versions
 
 ##### Arm Mbed Online Compiler
 
-The Mbed Online Compiler is our in-house IDE and should be familiar to anyone who's been working with Mbed for a while. It switches the backing toolchain based on the architecture version as in the table below.
+The Mbed Online Compiler is our in-house IDE, and should be familiar to anyone who's been working with Mbed for a while. It switches the backing toolchain based on the architecture version as in the table below.
+
 
 | Architecture version | Compiler |
 |----                  |----           |
-| Arm v6M       | `Arm Compiler 6.11` or `Arm Compiler 5.06 update 6` based on the Arm toolchain supported by the target (see `supported_toolchains` in [Adding and configuring targets](../reference/configuration/mbed_targets.html)) |
-| Arm v7M       | `Arm Compiler 6.11` or `Arm Compiler 5.06 update 6` based on the Arm toolchain supported by the target (see `supported_toolchains` in [Adding and configuring targets](../reference/configuration/mbed_targets.html)) |
+| Arm v6M       | `Arm Compiler 6.11` or `Arm Compiler 5.06 update 6` based on the ARM toolchain supported by the target (see `supported_toolchains` in [Adding and configuring targets](../reference/configuration/mbed_targets.html#)) |
+| Arm v7M       | `Arm Compiler 6.11` or `Arm Compiler 5.06 update 6` based on the ARM toolchain supported by the target (see `supported_toolchains` in [Adding and configuring targets](../reference/configuration/mbed_targets.html#)) |
 | Arm v7A       | `Arm Compiler 6.11` |
 | Arm v8M       | `Arm Compiler 6.11` |
 
 For more information, please see the [Online Compiler page](developing-mbed-online-compiler.html).
 
-<span class="note"> **Note:** With Mbed-OS 5.12 release, ARM Compiler 6 will be the default ARM toolchain for all Mbed OS targets. Majority of Mbed OS targets/platforms are already compatible with ARM Compiler 6. Few targets currently using/supporting ARM Compiler 5 will also be migrated to ARM Compiler in future. Please be aware that all new/existing Mbed OS targets/developers must use ARM Compiler 6 for future development as all source code contributions to Mbed OS will be validated with ARM Compiler 6. </span>
+<span class="note"> **Note:** With Mbed-OS 5.12 release, ARM Compiler 6 will be the default ARM toolchain for all Mbed OS targets. Majority of Mbed OS targets/platforms are already compatible with ARM Compiler 6. Few targets currently using/supporting ARM Compiler 5 will also be migrated to ARM Compiler in future. Please be aware that all new/existing Mbed OS targets/developers must use ARM Compiler 6 for future development and all code contributions to Mbed OS will be validated with ARM Compiler 6. </span>
 
 ##### Third party development tools