Verify and document keyboard shortcuts

Keyboard shortcut documentation is a bit outdated. We need to verify and document keyboard shortcuts.

https://doc.qt.io/qtdesignstudio/creator-keyboard-shortcuts.html

Todo:

• If a keyboard shortcut doesnt work, verify that it is listed in Edit > Preferences > Keyboard.
  • If its not listed, remove it from QDS documentation.
  • If it is listed, take a note, and we will create a bug report later.
• Re-organize in a more logical order wherever possible.