API docs FormattableMarkup::placeholderFormat %variable example contain errors

API page: https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Component%21Rend...

On protected static function FormattableMarkup::placeholderFormat, there are a couple issues with the %variable placeholders section.

The example code has the following line:

$arguments = ['output_text' => 'text output here.'];

Should be this (missing %):

$arguments = ['%output_text' => 'text output here.'];

The html example looks like this:

<em class="placeholder">text output here.em>

Should look like this:

<em class="placeholder">text output here.</em>