fix ProgressBar::new() example

Author: 2bndy5

clang-installer/src/progress_bar.rs

@@ -37,9 +37,13 @@ impl ProgressBar {
     /// Creates a new `ProgressBar` instance.
     ///
     /// This is considered infallible, but it is recommended to call [`Self::render()`] immediately after instantiation.
+    ///
     /// ```
+    /// use std::num::NonZero;
     /// use clang_installer::ProgressBar;
-    /// let mut progress_bar = ProgressBar::new(Some(100), "Downloading");
+    ///
+    /// let total = NonZero::new(100);
+    /// let mut progress_bar = ProgressBar::new(total, "Downloading");
     /// progress_bar.render().unwrap(); // render 0% state
     /// progress_bar.inc(50).unwrap(); // render 50% state
     /// progress_bar.inc(50).unwrap(); // render 100% state