Some minor changes to the introduction article in guidebook

[UvMidnight]

Some minor changes to the introduction article that, in my opinion, help the readability of the article.

Few notes:

Remembers is a word that adds a lot more connotations, but helps the comparison to currency. Spirits favor should have an apostrophe and be capitalized: "Spirit's Favor". Did not want to change this vocabulary- the shift from cycle to time is much smaller. The word day has been removed - depending on the linquistic background, this may lead the reader to believe initially that spirits are only active during the daytime, like some sort of solar panel. There is an missing a before the last spirit on line 20. Forgot to do this.

[Aurocosh]

Thanks. English is not my native, so some parts of guidebook might be not very readable.