updated source file (#1048)

source file

Author: adugamayuba

SOURCES.html

@@ -129,6 +129,6 @@ <h2>A rough guide to the documents used to build the HTML specification</h2>
         <dd>About 2200 entities that are defined to represent glyphs</dd>
     </dl>
 
-    <p>Linking and references are handled by Bikeshed, using <a href="single-page.bs">single-page.bs</a></p>
+    <p>Linking and references are handled by Bikeshed, by using <a href="single-page.bs">single-page.bs</a></p>
 </body>
 </html>