docs: update links to TF-A issues tracker

developer.trustedfirmware.org is deprecated so we cannot use its issues
tracker anymore. Instead, the project will now make use of the issues
tracker associated with the project's Github mirror at [1].

Reflect this change in TF-A documentation.

[1] https://github.com/TrustedFirmware-A/trusted-firmware-a/issues

Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Change-Id: I912f7dafc74368dba4e61ba4c9f358d5bf8346a9
diff --git a/docs/process/commit-style.rst b/docs/process/commit-style.rst
index d7e937b..c287599 100644
--- a/docs/process/commit-style.rst
+++ b/docs/process/commit-style.rst
@@ -149,5 +149,5 @@
 .. _Conventional Commits: https://www.conventionalcommits.org/en/v1.0.0
 .. _Gerrit Change-Ids documentation: https://review.trustedfirmware.org/Documentation/user-changeid.html
 .. _Gerrit Signed-off-by Lines guidelines: https://review.trustedfirmware.org/Documentation/user-signedoffby.html
-.. _issue: https://developer.trustedfirmware.org/project/board/1/
+.. _issue: https://github.com/TrustedFirmware-A/trusted-firmware-a/issues
 .. _quick summary: https://www.conventionalcommits.org/en/v1.0.0/#summary