frappe/webnotes/templates/emails/password_reset.html

<h3>Password Reset</h3>
<p>Dear {{ first_name }}{% if last_name %} {{ last_name}}{% endif %},</p>
<p>Please click on the following link to update your new password:</p>
<p><a href="{{ link }}">{{ link }}</a></p>
<p>Thank you,<br>
{{ user_fullname }}</p>