User blog comment:Rupert Giles/Layout Changes: Breakpoints and Typography/@comment-1250011-20150527041809/@comment-24409505-20150531165027

Tupka, apparently they already updated the table:

Original blog post (April 15, 2015):
 * First on the list is adding breakpoints to Wikia's responsive layout, and some related updates to typography. The typography changes will only happen at the largest breakpoint, which we are calling Desktop XL, currently defined as displays wider than 1575px .

Update (May 21, 2015)
 * In order to resolve some scrollbar-related bugs, we have shifted the breakpoints slightly. The Desktop breakpoint is now shifted to 1084 px, and the Desktop XL breakpoint is shifted to 1595 px . The tables on the main blog post and information on the help page have been updated accordingly.

But the values in the table are wrong by 1px.