[doc] clarify the default (fixes #601)
[doc] clarify the default (fixes #601)

Conflicts:
	doc/search/searchindex.js

mingodad/h2o,mingodad/h2o,mingodad/h2o,mingodad/h2o,mingodad/h2o,mingodad/h2o,mingodad/h2o,mingodad/h2o