Point to gerrit.googlesource.com/gitiles/ in templates and docs.

Change-Id: I5026c07dae1908b285f16261be6af0976ca969cc

Documentation/markdown.md

diff --git a/Documentation/markdown.md b/Documentation/markdown.md
index 8bf28f5..a5d5ec1 100644
--- a/Documentation/markdown.md
+++ b/Documentation/markdown.md
@@ -1,6 +1,6 @@
 # Markdown
 
-The [Gitiles](https://code.google.com/p/gitiles/) source browser
+The [Gitiles](https://gerrit.googlesource.com/gitiles/) source browser
 automatically renders `*.md` Markdown files into HTML for simplified
 documentation.