Fix syntax error

Fixes SyntaxError: positional argument follows keyword argument

Author: hsm207

Diff for: Chapter1_Introduction/Ch1_Introduction_TFP.ipynb

@@ -1208,7 +1208,7 @@
         "# Set the chain's start state.\n",
         "initial_chain_state = [\n",
         "    tf.cast(tf.reduce_mean(count_data), tf.float32) * tf.ones([], dtype=tf.float32, name=\"init_lambda1\"),\n",
-        "    tf.cast(tf.reduce_mean(count_data), tf.float32) * tf.ones([], dtype=tf.float32, name=\"init_lambda2\", tf.float32),\n",
+        "    tf.cast(tf.reduce_mean(count_data), tf.float32) * tf.ones([], dtype=tf.float32, name=\"init_lambda2\"),\n",
         "    0.5 * tf.ones([], dtype=tf.float32, name=\"init_tau\"),\n",
         "]\n",
         "\n",