style: modernize to splitseq, cut, min, maps.copy and range-over-int

lint/abi.go

@@ -74,7 +74,7 @@ func parseSignature(sig string) (*ast.FuncDecl, bool) {
 
 // signatureLine returns the first `func …` line from a doc comment, trimmed.
 func signatureLine(doc string) string {
-	for _, line := range strings.Split(doc, "\n") {
+	for line := range strings.SplitSeq(doc, "\n") {
 		if t := strings.TrimSpace(line); strings.HasPrefix(t, "func ") {
 			return t
 		}