Typo input -> output

[iwburns]

I'm submitting this before I create a PR just in case I'm misunderstanding what I'm reading, but I believe there's a typo in 1-basics.md:

Which won't produce any input. But change 42 to 40:
should probably read:
Which won't produce any output. But change 42 to 40:

Mind if I submit a PR for this?

EDIT: I also just found this:
how to write an slice type
should probably read:
how to write a slice type
or possibly even:
how to write a slice's type

Any thoughts/preference on that one?

[stevedonovan]

Well spotted. Yep, they all need fixing, so please go ahead with a PR