Update MXNetTutorialTemplate.ipynb (apache#13568)

Fix typos

example/MXNetTutorialTemplate.ipynb

@@ -13,7 +13,7 @@
    "source": [
     "A brief introduction to the tutorial that describes:\n",
     "\n",
-    "- The problem that that the tutorial addresses\n",
+    "- The problem that the tutorial addresses\n",
     "- Who the intended audience is\n",
     "- The expected experience level of that audience with a concept or tool \n",
     "- Which environment/language it runs in \n",
@@ -239,7 +239,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "If appropriate, summarize the tasks required to create the model, defining and explaining key concepts."
+    "If appropriate, summarize the tasks required to fit the model, defining and explaining key concepts."
    ]
   },
   {
@@ -342,7 +342,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "To *fperform the task*, *provide explanation here.*"
+    "To *perform the task*, *provide explanation here.*"
    ]
   },
   {