docs(features): update shell page

[dklassic]

What kind of changes does this PR include?

• New or updated content
  • Update /features/shell page

Description

• Closes #1488
• What does this PR change? Give us a brief description.
  • Update /features/shell page
  • Sneakily fixing a missing word in /features/window-state page

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[dklassic]

Closing this in favor of #1951