Fix a typo [ci skip]

Author: nobu

lib/reline/line_editor.rb

@@ -656,7 +656,7 @@ def add_dialog_proc(name, p, context = nil)
 
   private def padding_space_with_escape_sequences(str, width)
     padding_width = width - calculate_width(str, true)
-    # padding_width should be only positive value. But macOS and Aracritty returns negative value.
+    # padding_width should be only positive value. But macOS and Alacritty returns negative value.
     padding_width = 0 if padding_width < 0
     str + (' ' * padding_width)
   end