Doc: update changelog; fix typo

Author: CarterLi

CHANGELOG.md

@@ -1,4 +1,4 @@
-# 2.50.0 (expected release date: 2025-08-14)
+# WIP
 
 Changes:
 * Percent bar config `display.bar.*` options have been replaced with a more organized, nested object structure.
@@ -9,7 +9,7 @@ Changes:
 
 Features:
 * Add `display.bar.border.{leftElapsed,rightElapsed}` for using border as parts of bar content. (#1875)
-    * `display.bar.border: null` has been added as a shortand to disable bar borders.
+    * `display.bar.border: null` has been added as a shorthand to disable bar borders.
 * Add `display.bar.color.{elapsed,total,border}` to customize the color of the elapsed, total and border sections of the percent bar.
     * `display.bar.color: null` has been added as a shorthand to disable bar colors.