docs: Add tracker-sparql documentation into fixxref search path
The libtracker-miner library depends on libtracker-sparql and uses some of the types defined there. The docs refer to these types, which previously produced warnings and broken links: html/TrackerDecorator.html:739: warning: no link for: "TrackerSparqlBuilder" -> (<span class="type">TrackerSparqlBuilder</span>). html/TrackerMiner.html:124: warning: no link for: "TrackerSparqlConnection" -> (<span class="type">TrackerSparqlConnection</span>). html/TrackerMiner.html:655: warning: no link for: "tracker-sparql-connection-get" -> (<code class="function">tracker_sparql_connection_get()</code>). With this change, the warnings are gone and the links to types from libtracker-sparql work as expected.
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