chore: updating training docs with tips / jumprelu

[chanind]

Description

This PR updates the docs with some more tips for SAE training, adds jumprelu SAEs to the docs, and fixes some minor errors in the docs (missing params, inconsistent citation, etc...)

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

Checklist:

• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] I have not rewritten tests relating to key interfaces which would affect backward compatibility

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.80%. Comparing base (998c277) to head (52f2dfb). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #366 +/- ## ======================================= Coverage 66.80% 66.80% ======================================= Files 25 25 Lines 3389 3389 Branches 434 434 ======================================= Hits 2264 2264 Misses 1005 1005 Partials 120 120 ```

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[chanind]

Merging as this is just a docs update which is pretty low-stakes. @jbloomAus if you have thoughts on this after merging we can fix in a follow-up PR.