fix: Update DDS URL (#19)

Author: charmasaur

examples/export-a-dynamical-decoupling-sequence-to-pyquil.ipynb

@@ -52,7 +52,7 @@
     "\n",
     "This section demonstrates how a DDS can be prepared and a corresponding pyQuil program made and executed on a Quantum Virtual Simulator (QVM).\n",
     "\n",
-    "Q-CTRL Open Controls defines a DDS as a set of instantaneous unitary operations performed at specific offset times, see the [technical documentation](https://docs.q-ctrl.com/control-library#dynamical-decoupling-sequences) for mathematical details.\n",
+    "Q-CTRL Open Controls defines a DDS as a set of instantaneous unitary operations performed at specific offset times, see the [technical documentation](https://docs.q-ctrl.com/open-controls/references/qctrl-open-controls/qctrlopencontrols/DynamicDecouplingSequence.html) for mathematical details.\n",
     "\n",
     "pyQuil implements quantum computation through `Program` that contains a series of [gates](http://docs.rigetti.com/en/stable/apidocs/gates.html). How these gates are physically implemented will depend on the device that it is run on. Rigetti's documentation gives an oversight on Rigetti's [native gates](http://docs.rigetti.com/en/stable/apidocs/gates.html#native-gates-for-rigetti-qpus) and other [physically realizable gates](http://docs.rigetti.com/en/stable/apidocs/gates.html#all-gates-and-instructions).\n",
     "\n",
@@ -767,13 +767,6 @@
     "\n",
     "In the ideal noiseless simulator, both the Ramsey DDS and Quadratic DDS produced exactly the same outcome, the $|1 \\rangle$ state with probability 1. However, in a real device, we can see a marked difference. The Quadratic DDS produced a probability distribution closer to the expected outcome. This is because the Quadratic DDS is able to cancel the effects of magnetic noise in the environment - extending the [T2 time](https://en.wikipedia.org/wiki/Spin–spin_relaxation), and effectively increasing the coherence of the qubit."
    ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
-   "source": []
   }
  ],
  "metadata": {
@@ -792,7 +785,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.3"
+   "version": "3.7.10"
   },
   "toc": {
    "base_numbering": 1,