Fix spelling mistake

examples/user_guide/Dynamic_Parameters.ipynb

@@ -131,7 +131,7 @@
    "id": "7970ed77",
    "metadata": {},
    "source": [
-    "## Using a gobal time variable\n",
+    "## Using a global time variable\n",
     "\n",
     "As you can see, dynamic parameters are _very_ dynamic by default, changing every single time they are accessed. What if you want a \"somewhat dynamic\" value that changes only in certain well-defined situations? For instance, what if you are running a simulation, and you want a new dynamic value whenever time `t` changes, but otherwise the value should be constant so that no matter how many times the parameter is read at that time `t`, the result is the same? Or you are running a training or annealing or sampling or similar process that has many different iterations or runs, and you want values to change only when the iteration or run number changes, and otherwise to have the same value for a given iteration or run? \n",
     "\n",