We send the below language string.
Code:
'UE_NEWPASS_MSG' => 'The user account %s has this email associated with it.\nA web user from %s has just requested that a new password be sent.\n\nYour New Password is: %s\n\nIf you didn\'t ask for this, don\'t worry. You are seeing this message, not them. If this was an error just log in with your new password and then change your password to what you would like it to be.',
You can use language overrides as shown below to override it with whatever you like.