[tracker] (6 commits) Non-fast-forward update to branch wip/carlosg/doc-improvements

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/doc-improvements' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  bba62aa... docs: Flesh out SPARQL tutorial
  e868841... libtracker-sparql: Add some documentation about allowed mul
  708e98e... libtracker-sparql: Add API docs on update_blank() return va
  605dfcd... docs: Update and modernize code examples
  aabab69... libtracker-sparql: Drop gtk-doc specific syntax
  b3178eb... libtracker-sparql: Drop mentions to pre-3.0 API versions

Commits added to the branch:

  67550a1... docs: Flesh out SPARQL tutorial
  314fa95... libtracker-sparql: Add some documentation about allowed mul
  9acffe4... libtracker-sparql: Add API docs on update_blank() return va
  63ab52c... docs: Update and modernize code examples
  01115e8... libtracker-sparql: Drop gtk-doc specific syntax
  b01208c... libtracker-sparql: Drop mentions to pre-3.0 API versions