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[docs] Improve searchability of "Methods" section
The primary goal here is to have this section appear first (or at least high) when using the docs search for "function". I'm not fully satisfied with this solution, so open to alternative suggestions.
Maybe “In a strict sense, Pkl does not have functions.”
Not totally sure what this means. Do you mean to express that functions in Pkl have this as a receiver, so the result of a function is not just defined in terms of of the function's explicit arguments?
Simplified this back down to just adding reference to the function keyword.
I'm a bit bummed about the header not including "function" as it likely pushes this below several other sections in the search. Ideally the antora lunr extenion would support indexing hints so "function" could be added as a hint for this section to address that, but alas.