[manual-of-style] "Level" in titling convention?

[koalie]

TODO: check for accuracy; fix as needed

Section 5.1 Document Title says:

"Level" [...] deprecated. Try not to invent a new titling convention.

Yet, we routinely publish specs that use "Level", such as "Navigation Timing Level 2"
cf. https://www.w3.org/TR/?filter-tr-name=level

[deniak]

Thanks @koalie. We do have a lot of specs using "level" in their title (especially the ones from the CSS WG) and AFAIK, it wasn't announced that this term is deprecated.
It seems hard to change that convention now since one of the largest WG is using it...

/cc @plehegar