fix reftest-wait typo (#10276)

diff --git a/svg/linking/reftests/href-a-element-attr-change.html b/svg/linking/reftests/href-a-element-attr-change.html
index ceb0f18..c74b2e0 100644
--- a/svg/linking/reftests/href-a-element-attr-change.html
+++ b/svg/linking/reftests/href-a-element-attr-change.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html class="retest-wait">
+<html class="reftest-wait">
 <meta charset="utf-8">
 <title>href - a element</title>
 <meta name="assert"