Add task ID for TODOs about log rotation.

Summary:
There were two TODOs that I knew of in fbcode about this, so I decided to file
a task so we can track it.

Reviewed By: simpkins

Differential Revision: D8176921

fbshipit-source-id: 0ca45620050639659ac038dbed43acf4634f7a1d

folly/logging/FileHandlerFactory.cpp

@@ -30,8 +30,8 @@ class FileHandlerFactory::WriterFactory
       return true;
     }
 
-    // TODO: In the future it would be nice to support log rotation, and
-    // add parameters to control when the log file should be rotated.
+    // TODO(T29811675): In the future it would be nice to support log rotation,
+    // and add parameters to control when the log file should be rotated.
 
     return fileWriterFactory_.processOption(name, value);
   }