chore: typo fix

docs/docs/tutorials/introduction.ipynb

@@ -532,7 +532,7 @@
     "\n",
     "Recall that **edges** route the control flow from one node to the next. **Conditional edges** usually contain \"if\" statements to route to different nodes depending on the current graph state. These functions receive the current graph `state` and return a string or list of strings indicating which node(s) to call next.\n",
     "\n",
-    "Below, call define a router function called `route_tools`, that checks for tool_calls in the chatbot's output. Provide this function to the graph by calling `add_conditional_edges`, which tells the graph that whenever the `chatbot` node completes to check this function to see where to go next. \n",
+    "Below, define a router function called `route_tools` that checks for tool_calls in the chatbot's output. Provide this function to the graph by calling `add_conditional_edges`, which tells the graph that whenever the `chatbot` node completes to check this function to see where to go next. \n",
     "\n",
     "The condition will route to `tools` if tool calls are present and `END` if not.\n",
     "\n",