vim: Change the meaning of Shift+F2, Shift+F3, and F6.
vim: Change the meaning of Shift+F2, Shift+F3, and F6.

Original:
- Shift+F2: Unused.
- Shift+F3: Toggle the display of colorcolumn.
- F6: Toggle relative/absolute numbers.

Now:
- Shift+F2: Toggle the display of colorcolumn.
- Shift+F3: Toggle relative/absolute numbers.
- F6: Unused.

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