use "Groonga" notation
remove trailing spaces
doc: use "Groonga" notation

groonga ->
Groonga
^

gqtp ->
GQTP
^^^^
remove trailing spaces
Merge pull request #132 from cosmo0920/use-Groonga-notation-network

doc: use "Groonga" notation  related to network.txt and .po

Patch by cosmo. Thanks!!!
doc: fix markups for reference manual
Merge pull request #133 from cosmo0920/use-Groonga-notation-micro_blog

doc: use "Groonga" notation related to micro_blog.txt and .po

Patch by cosmo0920. Thanks!!!