Fixed typo / grammar docs

docs/10.5-clone-with-props.md

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-In rare situations a element may want to change the props of a element that it doesn't own (like changing the `className` of a element passed as `this.props.children`). Other times it may want to make multiple copies of a element passed to it. `cloneWithProps()` makes this possible.
+In rare situations an element may want to change the props of an element that it doesn't own (like changing the `className` of an element passed as `this.props.children`). Other times it may want to make multiple copies of an element passed to it. `cloneWithProps()` makes this possible.
 
 #### `ReactElement React.addons.cloneWithProps(ReactElement element, object? extraProps)`