Fix documentation

Change snippet about styling ParallelProgressIterator

src/lib.rs

@@ -107,13 +107,13 @@
 //!
 //! ```rust,ignore
 //! # extern crate rayon;
-//! use indicatif::{ProgressBar, ParallelProgressIterator};
+//! use indicatif::{ProgressBar, ParallelProgressIterator, ProgressStyle};
 //! use rayon::iter::{ParallelIterator, IntoParallelRefIterator};
 //!
-//! // Use `ProgressBar::with_style` to change the view
-//! let pb = ProgressBar::new();
+//! // Alternatively, use `ProgressBar::new().with_style()`
+//! let style = ProgressStyle::default_bar();
 //! let v: Vec<_> = (0..100000).collect();
-//! let v2: Vec<_> = v.par_iter().progress_with(pb).map(|i| i + 1).collect();
+//! let v2: Vec<_> = v.par_iter().progress_with_style(style).map(|i| i + 1).collect();
 //! assert_eq!(v2[0], 1);
 //! ```
 //!