docs: fix version number

Co-authored-by: Marcel Klehr <mklehr@gmx.net>
Signed-off-by: janepie <49834966+janepie@users.noreply.github.com>

lib/public/TaskProcessing/TaskTypes/TextToTextProofread.php

@@ -21,7 +21,7 @@
  */
 class TextToTextProofread implements ITaskType {
 	/**
-	 * @since 30.0.0
+	 * @since 31.0.0
 	 */
 	public const ID = 'core:text2text:proofread';
 	private IL10N $l;