doc: correct command lines of groonga executable in the client mode
doc: correct command lines of groonga executable in the client mode

"--host" option is not available in the client mode.

kenhys/groonga,groonga/groonga,komainu8/groonga,groonga/groonga,groonga/groonga,kenhys/groonga,kenhys/groonga,naoa/groonga,komainu8/groonga,komainu8/groonga,groonga/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,groonga/groonga,naoa/groonga,komainu8/groonga,kenhys/groonga,naoa/groonga,naoa/groonga,groonga/groonga,naoa/groonga,kenhys/groonga,naoa/groonga,kenhys/groonga,naoa/groonga,komainu8/groonga,naoa/groonga,komainu8/groonga,komainu8/groonga