docs: xref doesn't render in title

The `post-build-hook` text currently appears in the index, but not on the actual title line of the section, this follows the pattern used in a previous section to get a reference into a title.
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Kevin Stock 2019-11-02 17:55:53 -04:00 committed by GitHub
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@ -5,7 +5,7 @@
version="5.0"
>
<title>Using the <xref linkend="conf-post-build-hook" /></title>
<title>Using the <option linkend="conf-post-build-hook">post-build-hook</option></title>
<subtitle>Uploading to an S3-compatible binary cache after each build</subtitle>