docs(authz): fix typo and minor edits in spec/01_concepts.md

[barriebyron]

fixed a typo and made some minor edits while I was in here
let's add the "hey, at a glance you might think this is auth, but no, it's authz" note for clarity

Description

Closes: #XXXX

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[ryanchristo]

Thanks for the pull request!

I noticed another typo on line 31 that would be nice to fix here:

- `spent_limit` keeps track of how many coins are left in the authorization.

This should be spend_limit. Can you add the fix here?

[amaury1093]

lgtm (would like to see Ryan's fix above too in this PR)

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