docs: hide model import in multiple_tools.ipynb (#20883)

**Description:** 
This PR removes an unnecessary code snippet from the documentation. The
snippet in question is not relevant to the content and does not
contribute to the overall understanding of the topic. It contained
redundant imports and unused code, potentially causing confusion for
readers.

**Issue:** 
There is no specific issue number associated with this change.

**Dependencies:** 
No additional dependencies are required for this change.

---------

Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Bagatur <baskaryan@gmail.com>

docs/docs/use_cases/tool_use/multiple_tools.ipynb

@@ -136,6 +136,9 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "# | echo: false\n",
+    "# | output: false\n",
+    "\n",
     "from langchain_anthropic import ChatAnthropic\n",
     "\n",
     "llm = ChatAnthropic(model=\"claude-3-sonnet-20240229\", temperature=0)"