I was unhappy with the comments-in-yaml approach; it required
duplicating a lot of information and it was hard to find a balance
between "usefully thorough" and "readably concise.""
...Or at least, the namespace is passed around in helm's linting code. I
haven't proven that there's a case where omitting the namespace can
cause a linting problem, but I've seen enough to go ahead and document
the setting.
