docs: add info for mutation enchantments

[RoyalFox2140]

Purpose of change

There was poor documentation for adding effects via mutation, I added documentation for doing this with mutation enchantments.

Describe the solution

In json_info.md The field for enchantments is added.

in effects_json.md I gave an in-repo example of a mutation that grants an enchantment, and an example of an enchantment that grants a permanent effect.

Describe alternatives you've considered

Keeping it a mystery because that's funnier. Bugging others.

Testing

It's docs.

Additional context

Pain

[autofix-ci]

The Autofix app has found code style violation and automatically formatted this Pull Request.

I locally edit my commits (e.g: git, github desktop)

Please choose following options:

I'd like to accept the automated commit

1. Run git pull. this will merge the automated commit into your local copy of the PR branch.
2. Continue working.

I do not want the automated commit

1. Format your code locally, then commit it.
2. Run git push --force to force push your branch. This will overwrite the automated commit on remote with your local one.
3. Continue working.

If you don't do this, your following commits will be based on the old commit, and cause MERGE CONFLICT.

This PR is complete and I don't want to edit it anymore

It's safe to ignore this message.

I edit this PR through web UI

You can ignore this message and continue working.

I have no idea what this message is talking about

You can ignore this message and continue working. If you find any problem, please ask for help and ping @scarf005.

[RoyalFox2140]

A note to onlookers that want to change the docs, don't assume because you're in an IME that it will be formatted on the web page. Use json

I hate that tackling a change request comment will correctly reseolve the associated conversation but doesn't dismiss the linked review weh >:C

[chaosvolt]

Seems to be gud :>

[scarf005]

dismissing existing reviews doesn't do anything, approving does.