Add codespell to precommit and fix typos found

[rdimaio]

fixes #423

[voetberg]

Some questions:

• Do we have a way to whitelist certain words? Codespell does a pretty good job but I have noticed it gets mad about things like rses.
• Do we have a way to one-off ignore suggestions? Like the # ignore tag but for md?
• Can you include instructions to run the precommit locally?

[rdimaio]

* Do we have a way to whitelist certain words? Codespell does a pretty good job but I have noticed it gets mad about things like `rses`.

Yes: https://github.com/codespell-project/codespell?tab=readme-ov-file#using-a-config-file

[codespell]
dictionary = mydict,-
ignore-words-list = bar,-foo

* Do we have a way to one-off ignore suggestions? Like the `# ignore` tag but for md?

Yes: https://github.com/codespell-project/codespell?tab=readme-ov-file#inline-ignore

* Can you include instructions to run the precommit locally?

It should just be a matter of installing the precommit, along the lines of https://rucio.github.io/documentation/contributing/#1-prerequisite - I could add the same instructions here: https://github.com/rucio/documentation/blob/main/CONTRIBUTING.md
edit: just realized that the contributing guide for the docs repo already has installation instructions: https://github.com/rucio/documentation/blob/main/CONTRIBUTING.md#git-hooks