Changed algorithm docs to reflect the fact that hidden layer paramete…

[erictraut]

…rs are now exposed for PPO as well as APEX.

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PR Review Checklist:

• [ ] Test search functionality on desktop
• [ ] Test search functionality on mobile
• [ ] Test filter functionality
• [ ] Test mobile header navigation
• [ ] Test desktop header navigation
• [ ] Test desktop homepage navigation
• [ ] Run npm run check-links with 0 broken links
• [ ] Run npm run write-good <files being edited> to "lint" the docs