Remove mistaken no cover pragma

Author: Motta Kin

tests/test_examples.py

@@ -306,7 +306,7 @@ def id(self) -> str | None:
 
     @property
     def instructions(self) -> str | None:
-        return None  # pragma: no cover
+        return None
 
     async def __aenter__(self) -> MockMCPServer:
         return self