Merge pull request google-gemini#49 from kinarr/python-update-system-instruction-naming

Update naming in the Python system instruction sample

Author: pcoet

python/system_instruction.py

@@ -17,7 +17,7 @@
 
 class UnitTests(absltest.TestCase):
 
-    def test_system_instructions(self):
+    def test_system_instruction(self):
         # [START system_instruction]
         from google import genai
         from google.genai import types