Include autolink text in Markdown heading anchors

internal/validation/markdown_test.go

@@ -61,7 +61,10 @@ func TestParseMarkdownHeadingAnchors(t *testing.T) {
 		"# Foo\n" +
 		"# Foo-1\n" +
 		"# Foo\n" +
-		"# Foo-1\n")
+		"# Foo-1\n" +
+		"# <https://example.invalid>\n" +
+		"# <maintainer@example.invalid>\n" +
+		"# Contact <maintainer@example.invalid> Today\n")
 	document := parseMarkdown(source)
 	for _, anchor := range []string{
 		"café--東京-code-here-bold",
@@ -71,13 +74,16 @@ func TestParseMarkdownHeadingAnchors(t *testing.T) {
 		"foo-1-1",
 		"foo-2",
 		"foo-1-2",
+		"httpsexampleinvalid",
+		"maintainerexampleinvalid",
+		"contact-maintainerexampleinvalid-today",
 	} {
 		if _, ok := document.anchors[anchor]; !ok {
 			t.Errorf("missing anchor %q in %#v", anchor, document.anchors)
 		}
 	}
-	if len(document.anchors) != 7 {
-		t.Fatalf("found %d anchors, want 7: %#v", len(document.anchors), document.anchors)
+	if len(document.anchors) != 10 {
+		t.Fatalf("found %d anchors, want 10: %#v", len(document.anchors), document.anchors)
 	}
 }