Merge pull request #119 from Kapishin/master

Improve markup and fix typos
Create Symcall.rst
Update Symcall.rst
Update Symcall.rst
Update Symcall.rst
Update Symcall.rst
Update Symcall.rst
Update Symcall.rst
Update Symcall.rst
Update index.rst
Fix reference to FreeBSD sysctl(8) variable