spec: `matchN` is not mentioned

[jpluscplusm]

What version of CUE are you using (cue version)?

n/a

Does this issue reproduce with the latest stable release?

n/a

What did you do?

I visted https://cuelang.org/docs/reference/spec/ to learn about the built-in function matchN.

What did you expect to see?

Some mention of the function.

What did you see instead?

No matches when I searched the page for matchN.

[mvdan]

I suspect the same applies to matchIf.