add "r" to rbuildfiles example in query documentation.
@@ -1027,7 +1027,7 @@ genrule(
</p>
<h3 id="rbuildfiles">Package definition files: rbuildfiles</h3>
-<pre>expr ::= buildfiles(<var>expr</var>)</pre>
+<pre>expr ::= rbuildfiles(<var>expr</var>)</pre>
<b>Only available with <a href='#sky-query'>Sky Query</a></b><br/>
<p>
The <code>rbuildfiles(<var>x</var>)</code> operator returns the set of "buildfiles" (BUILD and
