Fix typo

snippets/MultiselectCheckbox.md

@@ -3,7 +3,7 @@
 Renders a checkbox list that uses a callback function to pass its selected value/values to the parent component.
 
 * Use `React.setState()` to create a `data` state variable and set its initial value equal to the `options` prop.
-* Create a function `toggle` that is used to toggle the `checked` to update the `data` state variable and call the `onChange` callbac passed via the component's props.
+* Create a function `toggle` that is used to toggle the `checked` to update the `data` state variable and call the `onChange` callback passed via the component's props.
 * Render a `<ul>` element and use `Array.prototype.map()` to map the `data` state variable to individual `<li>` elements with `<input>` elements as their children.
 * Each `<input>` element has the `type='checkbox'` attribute and is marked as `readOnly`, as its click events are handled by the parent `<li>` element's `onClick` handler.