Update opentelemetry-sdk/src/opentelemetry/sdk/_metrics/__init__.py

Co-authored-by: Diego Hurtado <ocelotl@users.noreply.github.com>

Author: aabmass

opentelemetry-sdk/src/opentelemetry/sdk/_metrics/__init__.py

@@ -375,7 +375,6 @@ def force_flush(self) -> bool:
         return True
 
     def shutdown(self, timeout_millis: float = 10_000):
-        # FIXME implement a timeout
 
         def _shutdown():
             self._shutdown = True