[css-syntax-3] Clarify the grammar for parsing `@media` contents

[cdoublev]

I'm aware that parse a stylesheet and parse a list of rules are nearly identical:

• both consumes rules
• the former handle HTML comment open/close tokens and returns an object holding rules
• the latter only returns the rules

But I'm confused by the following:

"Parse a list of rules" is intended for the content of at-rules such as @media.

https://drafts.csswg.org/css-syntax-3/#parser-entry-points

@media <media-query-list> {
  <stylesheet>
}

https://drafts.csswg.org/css-conditional-3/#at-media

I think that the first quote is incorrect, and that @keyframes could replace @media in this quote.

EDIT 1:

If a given context is only intended to accept at-rules, such as in @font-features-values, it doesn’t actually matter which production is used, but <rule-list> is preferred for its more straightforward name.

I assume the above means it doesn’t actually matter which production is used, <stylesheet> or <rule-list>, but <rule-list> [...].

This helps clarifying the different types used in CSS Syntax and CSS Conditional but the return value of parse a stylesheet and parse a list of rules actually have different shapes. But this may be a minor difference that is not worth clarifying, I do not know.

EDIT 2: I realized that parsing <stylesheet> does not mean parse a stylesheet, I'm sorry.