Update with link to #576

docs/circuit_cutting/how-tos/how_to_optimize_transpilation.ipynb

@@ -11,7 +11,7 @@
     "\n",
     "It is possible instead to optimize the workflow by performing the bulk of transpilation up front, followed by some minor passes over the generated circuits (e.g., to ensure they uses the basis gates available on the hardware, or to perform local optimizations).  This guide provides one way to do this.\n",
     "\n",
-    "NOTE: The steps in this guide only work if the circuit is _separated_ by the cut gates.  If you are performing circuit cutting to reduce a circuit's depth, then this will not work.  See open issue."
+    "NOTE: The steps in this guide only work if the circuit is _separated_ by the cut gates.  If you are performing circuit cutting to reduce a circuit's depth, then the following steps will not work.  See issue [#576](https://github.com/Qiskit-Extensions/circuit-knitting-toolbox/issues/576) for details."
    ]
   },
   {