Use lowercase reviewkungfu.html for consistency with other files

Change-Id: Ic9e2bc831efed1abd9deb49ce563abea671d846a

pages/site/docs/ReviewKungFu.md

diff --git a/pages/site/docs/ReviewKungFu.md b/pages/site/docs/ReviewKungFu.md
index dec4daa..2c37c3f 100644
--- a/pages/site/docs/ReviewKungFu.md
+++ b/pages/site/docs/ReviewKungFu.md
@@ -1,6 +1,6 @@
 ---
 title: "Review Kung Fu"
-permalink: ReviewKungFu.html
+permalink: reviewkungfu.html
 hide_sidebar: true
 hide_navtoggle: true
 toc: false