Rename try run to try build

Author: Kobzol

site/frontend/templates/pages/help.html

@@ -23,7 +23,7 @@ <h3><b><code>@rust-timer</code> commands</b></h3>
     <code>@rust-timer queue</code>. This command is usually invoked as <code>@bors try @rust-timer
       queue</code>, which starts a bors <a
       href="https://rustc-dev-guide.rust-lang.org/tests/ci.html#try-builds">"try build"</a> (not a
-    merge). <code>@rust-timer</code> will wait for the try run to finish, and if it succeeds will
+    merge). <code>@rust-timer</code> will wait for the try build to finish, and if it succeeds will
     then queue a perf run.
   </p>
   <p><code>@rust-timer queue</code> has a few extra options that can be useful:</p>