Fix example multi-dot shortcut path expansion

[marcransome]

The 'Multi-dot shortcuts' tip suggests that running ^stat .... expands to ../../../.. but this contradicts a previous example demonstrating that cd .... is used to go up three levels, not four.

Running ^stat .... | head -1 on Fedora 42 yields:

  File: ../../..

And on macOS Sequoia, ^stat -x .... | head -1 produces:

  File: "../../.."

The expanded path in the example should read: ../../.. (i.e. three levels).

[sholderbach]

Thanks! Well spotted