docs: add snippet verification for docs/ pages (#2115)

examples/snippets/servers/prompt_image_content.py

@@ -0,0 +1,20 @@
+import mcp.types as types
+from mcp.server.fastmcp import FastMCP
+from mcp.server.fastmcp.prompts import base
+from mcp.server.fastmcp.utilities.types import Image
+
+mcp = FastMCP("Image Prompt Example")
+
+
+@mcp.prompt()
+def describe_image(image_path: str) -> list[base.Message]:
+    """Prompt that includes an image for analysis."""
+    img = Image(path=image_path)
+    return [
+        base.UserMessage(
+            content=types.TextContent(type="text", text="Describe this image:"),
+        ),
+        base.UserMessage(
+            content=img.to_image_content(),
+        ),
+    ]