made git.show_on_dirs doc more concise

Author: chomosuke

doc/nvim-tree-lua.txt

@@ -593,8 +593,6 @@ Git integration with icons and colors.
 
     *nvim-tree.git.show_on_open_dirs*
     Show status icons of children on directories that are open.
-    Note that setting this to `false` will still show ignored icon on ignored
-    directories and deleted icons on directories whose children are deleted.
     Only relevant when `git.show_on_dirs` is `true`.
       Type: `boolean`, Default: `true`