Lawyers and law firms interested in a dot-law address on the Internet instead of a dot-com will soon be able to purchase the domain name.While the .law name is being touted as a virtual shingle that indicates a licensed law practice to consumers, legal marketing experts caution that its return on investment may not be what attorneys expect.Since Internet use took off two decades ago, top-level domains or TLDs — the portion of a web address after the “dot” — have traditionally been limited to ones …