Simplify guide to verify link

Suggestion from minami4ffp3 on Jan. 23, 2022, 6:56 p.m.

The South Korean FDA website has the guide instructions, so the twitter link is no longer necessary.  I also removed the redundant mention in the "More" section.

Changes in this suggestion:

Comment from philipn on Jan. 23, 2022, 7:04 p.m.

Good catch. Accepting now. 💫