docs: Fix spelling mistakes in apis.ipynb (#9911)

- Description: Fix spelling mistakes in apis.ipynb
- Issue: [#9910](https://github.com/langchain-ai/langchain/issues/9910)

Co-authored-by: Fredrik Gullberg <fredrik.gullberg@klarna.com>

docs/extras/use_cases/apis.ipynb

@@ -145,7 +145,7 @@
    "source": [
     "## Functions \n",
     "\n",
-    "We can unpack what is hapening when we use the functions to calls external APIs.\n",
+    "We can unpack what is happening when we use the functions to call external APIs.\n",
     "\n",
     "Let's look at the [LangSmith trace](https://smith.langchain.com/public/76a58b85-193f-4eb7-ba40-747f0d5dd56e/r):\n",
     "\n",
@@ -155,10 +155,10 @@
     "https://www.klarna.com/us/shopping/public/openai/v0/api-docs/\n",
     "```\n",
     "\n",
-    "* The prompt then tells the LLM to use the API spec wiith input question:\n",
+    "* The prompt then tells the LLM to use the API spec with input question:\n",
     "\n",
     "```\n",
-    "Use the provided API's to respond to this user query:\n",
+    "Use the provided APIs to respond to this user query:\n",
     "What are some options for a men's large blue button down shirt\n",
     "```\n",
     "\n",
@@ -278,7 +278,7 @@
     "![Image description](/img/api_chain.png)\n",
     "\n",
     "* [Here](https://github.com/langchain-ai/langchain/blob/bbd22b9b761389a5e40fc45b0570e1830aabb707/libs/langchain/langchain/chains/api/base.py#L82) we make the API request with the API url.\n",
-    "* The `api_answer_chain` takes the response from the API and provides us with a natural langugae response:\n",
+    "* The `api_answer_chain` takes the response from the API and provides us with a natural language response:\n",
     "\n",
     "![Image description](/img/api_chain_response.png)"
    ]