app/views/devise/mailer/reset_password_instructions.html.erb
<p>Hello <%= @resource.email %>!</p>
<p>Someone has requested a link to change your password. You can do this through the link below.</p>
<p><%= link_to 'Change my password', edit_password_url(@resource, :reset_password_token => @token) %></p>
<p>If you didn't request this, please ignore this email.</p>
<p>Your password won't change until you access the link above and create a new one.</p>