fix typos and close a tag

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49669 b456876b-0849-0410-b77d-98878d47e9d5
OPcache is the new recommended bytecode cache, part of PHP 5.5 but installable in previous versions.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49670 b456876b-0849-0410-b77d-98878d47e9d5