Attorney’s fees — Offer of judgment — Enforceability — Electronic service — Error to find proposal for settlement unenforceable due to a failure to comply with the email formatting requirements of Rule of Judicial Administration 2.516 where plain language of section 768.79 and Rule of Civil Procedure 1.442 do not require service by email, and Rule of Judicial Administration 2.516 does not apply because a settlement offer is not a pleading subsequent to the initial pleading, an order, or a document filed with the court