fix examples to invert ratatui and tui-rs

examples/popup_placeholder.rs

@@ -2,12 +2,12 @@ use crossterm::event::{DisableMouseCapture, EnableMouseCapture};
 use crossterm::terminal::{
     disable_raw_mode, enable_raw_mode, EnterAlternateScreen, LeaveAlternateScreen,
 };
+use ratatui::backend::CrosstermBackend;
+use ratatui::layout::Rect;
+use ratatui::style::{Color, Style};
+use ratatui::widgets::{Block, Borders};
+use ratatui::Terminal;
 use std::io;
-use tui::backend::CrosstermBackend;
-use tui::layout::Rect;
-use tui::style::{Color, Style};
-use tui::widgets::{Block, Borders};
-use tui::Terminal;
 use tui_textarea::{Input, Key, TextArea};
 
 fn main() -> io::Result<()> {
@@ -34,9 +34,6 @@ fn main() -> io::Result<()> {
         y: 5,
     };
     textarea.set_style(Style::default().fg(Color::Yellow));
-
-    // set placeholder
-
     textarea.set_placeholder_style(Style::default());
     textarea.set_placeholder_text("prompt message");
     loop {