fix(core): Fix several misspellings

[b-long]

This PR fixes several misspellings.

Since doing this work manually seems like a waste of time, you might consider introducing automation to prevent spelling errors (I make them constantly).

One automatic spell-checker is https://github.com/codespell-project/codespell . It's very easy to run both locally and in CI, using pre-commit, e.g. the following will lint Go, Markdown, and YAML:

# To learn about "pre-commit", see:
#   https://github.com/pre-commit/pre-commit

repos:
-   repo: https://github.com/codespell-project/codespell
    rev: v2.2.6
    hooks:
    - id: codespell
      files: ^.*\.(go|md|yaml)$
      args: ["--write-changes", "--ignore-words-list", "MYCOOLWORD,ANOTHAONE"]

[jrschumacher]

This is a great idea! We already use golangci-lint which has the ability to add misspell to check for spelling errors. I'd prefer to minimize the number of external tools if we can. Would you give this a try to see how it compares?

Also I'm not sure we want to introduce precommits as this will need to be a more detailed conversation. Precommits are great for small teams but large opensource projects they can become burdensome and many projects lean on CI linters.

[b-long]

I've undone the addition of pre-commit. Sorry about that, I saw @jrschumacher 's comments before I pushed, and then saw @dmihalcik-virtru 's comments .

I did ask about this before I pushed, but didn't hear back earlier (see #736 🙊 🦗 )

My highest priority is to use the platform (work which has a deadline), so I'll let you all determine the best path forward in automation/linting. For now, this PR just fixes the existing spelling errors.