Add docs for reapply_sysctl TuneD functionality
Add docs for reapply_sysctl TuneD functionality

Also adding a forgotten operand `debug` option.

Signed-off-by: Jiri Mencak <4d0c742e67696f87ed9d4af7ba2a5175bba0e8bb@users.noreply.github.com>

vikram-redhat/openshift-docs,vikram-redhat/openshift-docs,vikram-redhat/openshift-docs,vikram-redhat/openshift-docs,vikram-redhat/openshift-docs