Convert from `<block location=" "/>` to `<block> </block>`

The [CTW Gamemode](http://docs.oc.tc/modules/gamemode_ctw) page tells you to use `<block>`, same with the [Regions](http://docs.oc.tc/modules/regions) page.

Found on the [RFV3](http://docs.oc.tc/examples/rfv3) example.