This commit adds a missing closing capture and puts "## Install kubectl" inside the relevant capture.
Note that the missing close was also missing before Hugo-migration, so the section ordering is still not the same as the Jekyll version of the site. But I think it is more corret.
Note that content outside the capture template blocks, is included as defined is this template:
https://github.com/kubernetes/website/blob/master/layouts/partials/templates/task.html#L8
See #8277
Steve Perry
Bjørn Erik Pedersen
Tom Van Waardhuizen