Minor style consistency fix

Author: jank324

tutorial.ipynb

@@ -358,7 +358,7 @@
     "\n",
     "### Timeline\n",
     "\n",
-    "- In development since March 2021 (initially as _\"JOSS 🤯\"_, renamed to _Cheetah_ in July 2021)\n",
+    "- In development since March 2021 (initially as _\"JOSS 🤯\"_, renamed to _\"Cheetah\"_ in July 2021)\n",
     "- First publicly released version 0.5.12 in June 2022\n",
     "- First fully differentiable release 0.6 in Septemeber 2023\n",
     "- Merged with Bmad-X beginning March 2024\n",