remove useless semicolon (#1486)

Author: mossa-Sammer

docs/api/connect.md

@@ -121,7 +121,7 @@ The second parameter is normally referred to as `ownProps` by convention.
 
 ```js
 // binds on component re-rendering
-;<button onClick={() => this.props.toggleTodo(this.props.todoId)} />
+<button onClick={() => this.props.toggleTodo(this.props.todoId)} />
 
 // binds on `props` change
 const mapDispatchToProps = (dispatch, ownProps) => {