Docs: Change wording from "this document" to "this page" for Bazel site pages

PiperOrigin-RevId: 352115854
diff --git a/site/docs/build-ref.html b/site/docs/build-ref.html
index 862b6f5..3eba968 100644
--- a/site/docs/build-ref.html
+++ b/site/docs/build-ref.html
@@ -4,7 +4,7 @@
 ---
 <h1>Concepts and Terminology</h1>
 <p>
-  This document provides an overview of the source tree layout and the
+  This page provides an overview of the source tree layout and the
   terminology used in Bazel.
 </p>
 <h2 id="intro">Introduction</h2>