Update release howto.
Project: http://git-wip-us.apache.org/repos/asf/commons-rng/repo
Commit: http://git-wip-us.apache.org/repos/asf/commons-rng/commit/c903bd87
Tree: http://git-wip-us.apache.org/repos/asf/commons-rng/tree/c903bd87
Diff: http://git-wip-us.apache.org/repos/asf/commons-rng/diff/c9
Update release howto.
Project: http://git-wip-us.apache.org/repos/asf/commons-rng/repo
Commit: http://git-wip-us.apache.org/repos/asf/commons-rng/commit/4bf4428c
Tree: http://git-wip-us.apache.org/repos/asf/commons-rng/tree/4bf4428c
Diff: http://git-wip-us.apache.org/repos/asf/commons-rng/diff/4b