message: docs: add ref to IE11 window memory leak issue
diff: @@ -3,9 +3,13 @@ import * as React from "react"
  let _window: Window | undefined = undefined
  -// Note: Accessing "window" in IE11 is somewhat expensive, and calling "typeof window"
  -// hits a memory leak, whereas aliasing it and calling "typeof _window" does not.
  -// Caching the window value at the file scope lets us minimize the impact.
  +/**
  + * Note: Accessing "window" in IE11 is somewhat expensive, and calling "typeof window"
  + * hits a memory leak, whereas aliasing it and calling "typeof _window" does not.
  + * Caching the window value at the file scope lets us minimize the impact.
  + *
  + * @see IE11 Memory Leak Issue https://github.com/microsoft/fluentui/pull/9010#issuecomment-490768427
  + */
  try {
  _window = window
  } catch (e) {
  