undo unnecessary change

Author: JyotinderSingh

guides/ipynb/functional_api.ipynb

@@ -58,13 +58,13 @@
     "<div class=\"k-default-codeblock\">\n",
     "```\n",
     "(input: 784-dimensional vectors)\n",
-    "       ↧\n",
+    "       \u21a7\n",
     "[Dense (64 units, relu activation)]\n",
-    "       ↧\n",
+    "       \u21a7\n",
     "[Dense (64 units, relu activation)]\n",
-    "       ↧\n",
+    "       \u21a7\n",
     "[Dense (10 units, softmax activation)]\n",
-    "       ↧\n",
+    "       \u21a7\n",
     "(output: logits of a probability distribution over 10 classes)\n",
     "```\n",
     "</div>\n",
@@ -1398,4 +1398,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 0
-}
+}