Skill Guide Fixes

Just a few quick fixes to a few of the skill guides today. I fixed the part about rings being "useless," which I had forgotten to update when the Enchantable Rings update happened. I also fixed a mistake in the cooking guide about Lava Eels healing 14 hits. I know there haven't been many big updates to the site for awhile now, but a new skill guide is on its way and will be here soon.

-Salmoneus