docs: Fix description (#22611)

This commit fixes the description of the hair_color field.

docs/docs/how_to/extraction_examples.ipynb

@@ -128,7 +128,7 @@
     "    # Having a good description can help improve extraction results.\n",
     "    name: Optional[str] = Field(..., description=\"The name of the person\")\n",
     "    hair_color: Optional[str] = Field(\n",
-    "        ..., description=\"The color of the person's eyes if known\"\n",
+    "        ..., description=\"The color of the person's hair if known\"\n",
     "    )\n",
     "    height_in_meters: Optional[str] = Field(..., description=\"Height in METERs\")\n",
     "\n",

libs/core/langchain_core/utils/function_calling.py

@@ -386,7 +386,7 @@ def tool_example_to_messages(
                 '''Information about a person.'''
                 name: Optional[str] = Field(..., description="The name of the person")
                 hair_color: Optional[str] = Field(
-                    ..., description="The color of the person's eyes if known"
+                    ..., description="The color of the person's hair if known"
                 )
                 height_in_meters: Optional[str] = Field(
                     ..., description="Height in METERs"