Update FAQ entry about releases.
Update FAQ entry about releases.

Fixes #472.

--
MOS_MIGRATED_REVID=103530183

bazelbuild/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website,bazelbuild/bazel-website