docs: fix spelling mistake in tools.mdx (#621)

Author: tobiasbueschel

docs/src/content/docs/guides/tools.mdx

@@ -85,7 +85,7 @@ Under the hood the SDK:
 - Runs the sub‑agent with that input when the tool is called.
 - Returns either the last message or the output extracted by `customOutputExtractor`.
 
-When you run an agent as a tool, Agents SDK creates a runner with the defualt settings and run the agent with it within the function execution. If you want to provide any properties of `runConfig` or `runOptions`, you can pass them to the `asTool()` method to customize the runner's behavior.
+When you run an agent as a tool, Agents SDK creates a runner with the default settings and run the agent with it within the function execution. If you want to provide any properties of `runConfig` or `runOptions`, you can pass them to the `asTool()` method to customize the runner's behavior.
 
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