Update readme.md; corrected some minor typos, capitalization, removed some...
Update readme.md; corrected some minor typos, capitalization, removed some double spaces and added missing periods at the end of sentences.
Notes:
- For consistency, I added a (T) to the second sentence's "...for the Amiga A3000(T)...", to match the title above it, which already included the (T).
- I'm not sure whether is supposed to be ""(?), so I left this alone.