message: Remove incorrect comment
  Summary:
  Stack elements are semicolon-separated, not colon separated.
  No need to document it, because `FlameGraphWriter` knows it, and this function should not know such details.
diff: @@ -251,8 +251,7 @@ struct StackFrame {
  }
  impl StackFrame {
  - /// Write this stack frame's data to a file in a format flamegraph.pl understands
  - /// (each line is: `func1:func2:func3 BYTES`).
  + /// Write this stack frame's data to a file in flamegraph.pl format.
  fn write_flame_graph<'a>(
  &self,
  file: &mut FlameGraphWriter,
  