edoc: prevent rogue punctuation highlights

Punctuation highlights would show up outside of where they
were valid, for example using parentheses in some text. This
change prevents that by gating the captures to being under
the named nodes in which they are valid.

runtime/queries/edoc/highlights.scm

@@ -39,9 +39,9 @@
 ; could be @constant.numeric.integer but this looks similar to a capture
 (arity) @operator
 
-[":" "/"] @operator
+(expression [":" "/"] @operator)
-["(" ")"] @punctuation.delimiter
+(expression ["(" ")"] @punctuation.delimiter)
-["{" "}"] @function.macro
+(macro ["{" "}"] @function.macro)
 
 [
   (quote_marker)