Adds RawMessage type alias, move vars to consts, and fixes some godoc…

… comments.

util/jsonutil/jsonutil.go

@@ -12,12 +12,17 @@ import (
 	"github.com/prebid/prebid-server/v3/errortypes"
 )
 
-var comma = byte(',')
-var colon = byte(':')
-var sqBracket = byte(']')
-var closingCurlyBracket = byte('}')
+const (
+	comma               byte = ','
+	colon               byte = ':'
+	sqBracket           byte = ']'
+	closingCurlyBracket byte = '}'
+)
+
+// RawMessage to allow replacing json with jsonutil
+type RawMessage = json.RawMessage
 
-// Finds element in json byte array with any level of nesting
+// FindElement finds element in json byte array with any level of nesting
 func FindElement(extension []byte, elementNames ...string) (bool, int64, int64, error) {
 	elementName := elementNames[0]
 	buf := bytes.NewBuffer(extension)
@@ -100,7 +105,7 @@ func FindElement(extension []byte, elementNames ...string) (bool, int64, int64,
 	return found, startIndex, endIndex, nil
 }
 
-// Drops element from json byte array
+// DropElement drops element from json byte array
 // - Doesn't support drop element from json list
 // - Keys in the path can skip levels
 // - First found element will be removed