Typos on page 7 in version 1.4 doc

[tomse]

I tried making a merge request, but alas I didn't know how to do that.

I've fixed some typos on page 7 in the documentation of v1.4 https://github.com/tomse/Versa64Cart/tree/master/v1.4 the PDF is updated, and added the fix as doc 1.4b

cheers