Use a script specific description in CLI help

Previous changes used the docstring of the test_generation module,
which does not inform a user about the script.

Signed-off-by: Werner Lewis <werner.lewis@arm.com>
diff --git a/tests/scripts/generate_bignum_tests.py b/tests/scripts/generate_bignum_tests.py
index b4915d8..ceafa4a 100755
--- a/tests/scripts/generate_bignum_tests.py
+++ b/tests/scripts/generate_bignum_tests.py
@@ -233,6 +233,6 @@
     def result(self) -> str:
         return quote_str("{:x}".format(self.int_a + self.int_b))
 
-
 if __name__ == '__main__':
-    test_generation.main(sys.argv[1:])
+    # Use the section of the docstring relevant to the CLI as description
+    test_generation.main(sys.argv[1:], "\n".join(__doc__.splitlines()[:4]))
diff --git a/tests/scripts/generate_psa_tests.py b/tests/scripts/generate_psa_tests.py
index 1f516c9..867a6b4 100755
--- a/tests/scripts/generate_psa_tests.py
+++ b/tests/scripts/generate_psa_tests.py
@@ -919,4 +919,4 @@
         super().generate_target(name, self.info)
 
 if __name__ == '__main__':
-    test_generation.main(sys.argv[1:], PSATestGenerator)
+    test_generation.main(sys.argv[1:], __doc__, PSATestGenerator)