A few small issues

These are a few updates to correct some minor issues.

First, the text for the Wealth finisher stated "Smithy" when that term isn't used anymore.
Second, a few places in the code I noticed the word "receive" misspelled so I corrected it.
Third, the Samurai unit was over-powered with a strength of 37.  I lowered it to 28.
Fourth, The Wheel tech should require Archery as a prerequisite.  It's strange building Chariot Archers without Archery.