* NEWS: Move Matrix changes to the right place

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47839 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* lib/matrix.rb: Add @- and @+ for Matrix and Vector.
  patch by gogo tanaka [#10068] [#10069]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47840 b2dd03c8-39d4-4d8f-98ff-823fe69b080e