Update seeding documentation to indicate what circuit readout processes are seeded

[paul0403]

Context:
Add a list of seeding-supported circuit readout methods to the documentation.

Benefits:
Avoid potential user misunderstanding when unseeded readout methods are used with a seed.

[github-actions]

Hello. You may have forgotten to update the changelog!
Please edit doc/releases/changelog-dev.md on your branch with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
• Your name (or GitHub username) in the contributors section.

[joeycarter]

Looks good to me, thanks! 🚀

[josh146]

@paul0403 to avoid duplicating effort, @joeycarter and I have already updated the docs here :) #1238

[josh146]

So this PR may cause a clash (feel free to merge them in a way that is appropriate)

[paul0403]

So this PR may cause a clash (feel free to merge them in a way that is appropriate)

Discussed with @joeycarter in person, we will merge this PR first and then resolve a small conflict in the changelog polish PR.