Update 'String tensors' section to correct string lengths

Author: Putnam14

site/en/guide/tensor.ipynb

@@ -1405,11 +1405,11 @@
       },
       "outputs": [],
       "source": [
-        "# If we have two string tensors of different lengths, this is OK.\n",
+        "# If we have three string tensors of different lengths, this is OK.\n",
         "tensor_of_strings = tf.constant([\"Gray wolf\",\n",
         "                                 \"Quick brown fox\",\n",
         "                                 \"Lazy dog\"])\n",
-        "# Note that the shape is (2,), indicating that it is 2 x unknown.\n",
+        "# Note that the shape is (3,), indicating that it is 3 x unknown.\n",
         "print(tensor_of_strings)"
       ]
     },