Improve (or, well, at least arbitrarily change) the descriptions of various settings in the graphics options.

More than a few of these have annoyed me for a while, what with their typos and odd wording and occasional lack of important details.

Criticisms welcome. I mean, as long as it doesn't devolve into MORE bikeshedding. Even I don't enjoy that.
On the desktop, all hardware which supports dolphin, also supports this feature. I think this option is left from our D3D9 time as dual-pass was the only way on this backend.