Update docs/tutorial/writing-tests/test-case.rst

Co-authored-by: Pierre Equoy <pierre.equoy@canonical.com>

docs/tutorial/writing-tests/test-case.rst

@@ -1137,7 +1137,7 @@ Running it you should see the following:
      ☑ : Check that vfork syscall shares the memory between parent and child
 
 .. warning::
-   Checkbox is delivered for many platforms so be mindful of what you include
+   Checkbox is delivered for many platforms (x86, ARM, etc.) so be mindful of what you include
    in the ``src/`` directory, especially if you plan to contribute the test
    upstream. It must be compatible with all architectures we build for, debian
    packages and snaps.