[PATCH] docs: Update FIT signature testing instructions

[Enric Balletbo i Serra]

Update the FIT signature testing instructions to use the pytest suite instead of
the old vboot_test.sh script.

Signed-off-by: Enric Balletbo i Serra <eballetbo at kernel.org>
---
 doc/usage/fit/signature.rst | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/doc/usage/fit/signature.rst b/doc/usage/fit/signature.rst
index b868dcbf9fdb28e85128d402478e3120dafcca2f..e5b5a8432e9eb1cb8ba727dc26e1e3a46cb41f51 100644
--- a/doc/usage/fit/signature.rst
+++ b/doc/usage/fit/signature.rst
@@ -433,16 +433,14 @@ CONFIG_LEGACY_IMAGE_FORMAT
 Testing
 -------
 
-An easy way to test signing and verification is to use the test script
-provided in test/vboot/vboot_test.sh. This uses sandbox (a special version
+An easy way to test signing and verification is to use the vboot tests
+provided in the pytest suite. This uses sandbox (a special version
 of U-Boot which runs under Linux) to show the operation of a 'bootm'
 command loading and verifying images.
 
 A sample run is show below::
 
-    $ make O=sandbox sandbox_config
-    $ make O=sandbox
-    $ O=sandbox ./test/vboot/vboot_test.sh
+    $ ./test/py/test.py --bd sandbox --build -k vboot
 
 
 Simple Verified Boot Test

---
base-commit: bcc7bc69b92ab728790aea0d08b2ae5e22d3b09d
change-id: 20250716-fix-signature-test-docs-335cc19f8b49

Best regards,
-- 
Enric Balletbo i Serra <eballetbo at kernel.org>