Procter & Gamble Co. has completed the sale of 6.5 acres of its Gillette campus in South Boston, reportedly for $218 million. That means the Cincinnati-based maker of consumer goods such as Gillette razors (NYSE: PG) recently pocketed a total of about $314 million for selling off several parts of the site in Massachusetts, which includes 24 buildings. When I reported in October that P&G had listed for sale 6.5 acres of a campus of more than 40 acres, a company spokeswoman said more than enough…