Think this is actually a great move by Microsoft to get people, like MVPs, to be able to help out with the contributions on BOL. I've made a few myself and the process can be slow, sometimes taking a month or so before things are signed off for even simple changes. Allowing people, like yourself, to sign off these changes will hopefully streamline the process.
I've found that the documents have been really useful of late, with the constant feed of improvements from the community, and think that moving it to be able to be community supported was a good idea; due to the wealth of knowledge that users have and the passion they share for SQL Server. This is just another way those users can contribute, along with sites like this, and share that wealth of knowledge with others; and enabling them to do so in a timely manner means that they are more likely to continue to do so.
Excuse my typos and sometimes awful grammar. My fingers work faster than my brain does.