fix clippy warnings in examples

examples/password.rs

@@ -23,7 +23,7 @@ fn main() -> io::Result<()> {
     textarea.set_cursor_line_style(Style::default());
     textarea.set_mask_char('\u{2022}'); //U+2022 BULLET (•)
     textarea.set_placeholder_text("Please enter your password");
-    let constraints = [Constraint::Length(3), Constraint::Min(1)].as_slice();
+    let constraints = [Constraint::Length(3), Constraint::Min(1)];
     let layout = Layout::default().constraints(constraints);
     textarea.set_style(Style::default().fg(Color::LightGreen));
     textarea.set_block(Block::default().borders(Borders::ALL).title("Password"));

examples/single_line.rs

@@ -38,8 +38,7 @@ fn main() -> io::Result<()> {
     let mut textarea = TextArea::default();
     textarea.set_cursor_line_style(Style::default());
     textarea.set_placeholder_text("Enter a valid float (e.g. 1.56)");
-    let layout =
-        Layout::default().constraints([Constraint::Length(3), Constraint::Min(1)].as_slice());
+    let layout = Layout::default().constraints([Constraint::Length(3), Constraint::Min(1)]);
     let mut is_valid = validate(&mut textarea);
 
     loop {

examples/variable.rs

@@ -32,7 +32,7 @@ fn main() -> io::Result<()> {
             let height = cmp::max(textarea.lines().len(), MIN_HEIGHT) as u16 + 2; // + 2 for borders
             let chunks = Layout::default()
                 .direction(Direction::Vertical)
-                .constraints([Constraint::Length(height), Constraint::Min(0)].as_slice())
+                .constraints([Constraint::Length(height), Constraint::Min(0)])
                 .split(f.size());
             f.render_widget(textarea.widget(), chunks[0]);
         })?;