test: update test case to reflect excepted new output from explain

Author: Realiserad

src/fish_ai/tests/explain_test.py

@@ -9,7 +9,8 @@
 @patch('fish_ai.engine.get_response', lambda messages: 'print hello')
 def test_successful_explain(capsys):
     explain()
-    assert capsys.readouterr().out == '# print hello'
+    assert capsys.readouterr().out == '# print hello \
+Example command: echo hello'
     assert capsys.readouterr().err == ''