ref-manual: Fixed broken link.

(From yocto-docs rev: b0ee7cf9ab8cb8f9beb490b9aac128c48b13af66)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/ref-manual/ref-classes.xml

@@ -3272,7 +3272,7 @@ This check was removed for YP 2.3 release
                 <para>
                 A shared state (sstate) object is built from these files
                 and the files are placed into a subdirectory of
-                <link linkend='structure-build-tmp-sysroots'><filename>tmp/sysroots-components/</filename></link>.
+                <link linkend='structure-build-tmp-sysroots-components'><filename>tmp/sysroots-components/</filename></link>.
                 The files are scanned for hardcoded paths to the original
                 installation location.
                 If the location is found in text files, the hardcoded