WordPress uses custom wp_mail function, so you won’t find it, if you’ll search for mail.
Just take a look at line 248 of wp-login.php file: http://core.trac.wordpress.org/browser/branches/3.5/wp-login.php#L248
You should find retrieve_password_message filter call there. This is the filter that returns the content of reset password message.
You should also check the implementation of wp_mail function, because you will have to add headers to your mail (you want to send it as html and not as plain text, I guess). You can use wp_mail_content_type filter to change it.
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