doc: specify the database name for examples
doc: specify the database name for examples

TODO: split execution examples from this file to the new file under
doc/source/example/.
The examples exist in this file directly now.

myokoym/groonga,groonga/groonga,komainu8/groonga,hiroyuki-sato/groonga,kenhys/groonga,redfigure/groonga,cosmo0920/groonga,groonga/groonga,kenhys/groonga,komainu8/groonga,hiroyuki-sato/groonga,naoa/groonga,cosmo0920/groonga,komainu8/groonga,hiroyuki-sato/groonga,redfigure/groonga,redfigure/groonga,komainu8/groonga,redfigure/groonga,kenhys/groonga,myokoym/groonga,komainu8/groonga,cosmo0920/groonga,kenhys/groonga,cosmo0920/groonga,cosmo0920/groonga,naoa/groonga,naoa/groonga,kenhys/groonga,kenhys/groonga,groonga/groonga,naoa/groonga,naoa/groonga,redfigure/groonga,hiroyuki-sato/groonga,hiroyuki-sato/groonga,myokoym/groonga,komainu8/groonga,komainu8/groonga,groonga/groonga,hiroyuki-sato/groonga,komainu8/groonga,redfigure/groonga,myokoym/groonga,kenhys/groonga,naoa/groonga,cosmo0920/groonga,redfigure/groonga,groonga/groonga,cosmo0920/groonga,myokoym/groonga,groonga/groonga,myokoym/groonga,redfigure/groonga,naoa/groonga,cosmo0920/groonga,groonga/groonga,naoa/groonga,hiroyuki-sato/groonga,groonga/groonga,myokoym/groonga,hiroyuki-sato/groonga,myokoym/groonga,kenhys/groonga