Adjusted distribution Kconfig such that CONFIG_GENTOO_LINUX has help information to avoid confusion due to an absence of explanation, also adjusted the rest of that file such that it now consistently uses the same word 'setting'.

git-svn-id: svn://anonsvn.gentoo.org/linux-patches@2493 00c4350b-4cf9-0310-8c1b-f3fed11d2be3