[Downstream Change] Improved wording on issue reporting in the contribution guide (#307)

Softened the wording of when to raise issues in LLVM/picolibc vs
arm-toolchain

ATfE and ATfL readme now signposts to the detailed information
in CONTRIBUTING.md.

Author: willlovett-arm

CONTRIBUTING.md

@@ -36,13 +36,15 @@ For guidance on how to contribute to the upstream projects see:
 
 ### Report an issue
 
-Please make sure that the issue is specific to the *arm-toolchain*
-before reporting. If the issue exists in *llvm-project* or *picolibc*
-then please report the issue in the upstream project.
+Arm Toolchain is heavily dependent on the *llvm* and *picolibc* projects.  If you have an issue that is generic to one of these projects, you may want to submit it directly:
+* [LLVM issue tracker](https://github.com/llvm/llvm-project/issues)
+* [Picolibc issue tracker](https://github.com/picolibc/picolibc/issues)
 
-Please create a GitHub issue in the *arm-toolchain* project
-[Issues](https://github.com/arm/arm-toolchain/issues)
-list.
+This will allow you to interact directly with this community, including Arm's development team.
+
+If the issue is in Arm Toolchain itself, or if you are not sure, please create a GitHub issue in the *arm-toolchain* project:
+* [Arm Toolchain issue tracker](https://github.com/arm/arm-toolchain/issues)
+* Please add the `ATfE` label for Arm Toolchain for Embedded issues, or `ATfL` for Arm Toolchain for Linux.
 
 ### Submit a fix
 

arm-software/embedded/README.md

@@ -204,8 +204,7 @@ guide for detailed instructions.
 
 ## Providing feedback and reporting issues
 
-Please raise an issue via [GitHub issues](https://github.com/arm/arm-toolchain/issues)
-and add the `ATfE` label if it is specific to the Arm Toolchain for Embedded.
+Please see the [Contribution Guide](../../CONTRIBUTING.md#report-an-issue) for guidance on how to report an issue or raise a feature request.
 
 ## Contributions and Pull Requests
 

arm-software/linux/README.md

@@ -306,8 +306,7 @@ $ chrpath -l ./example
 
 ## Providing feedback and reporting issues
 
-Please raise an issue via [GitHub issues](https://github.com/arm/arm-toolchain/issues)
-and add the `ATfL` label if it is specific to the Arm Toolchain for Linux.
+Please see the [Contribution Guide](../../CONTRIBUTING.md#report-an-issue) for guidance on how to report an issue or raise a feature request.
 
 ## Contributions and Pull Requests