Update types and add info about fragments

[nem035]

:memo: Update typos across the files and add some info about fragments in 04-components

Nice work! This can be used as a quality teaching tool.

I made a few tiny typo changes and added some notes on fragments. Let me know if I should take them out.

[kay-is]

lol, where does the sudden stream of PRs come from?

Anyway, thanks a lot :)

[nem035]

Glad to help mate :)

And I'd guess it's because Dan Abramov starred your repo (it's how I found out about it), that would provide a good amount of exposure 😄

[kay-is]

I see :D

Didn't even know he noticed it, lol