chore: clean up completed TODO comment in lab11.m

[tsainez]

🎯 What: Removed an outdated TODO comment in the MATLAB eigenface script.
⚠️ Risk: Low. This is purely a comment removal and does not affect the script execution or functional logic.
🛡️ Solution: Dropped the stale % TODO: compute coef string since the operation was already successfully computed via coef = U' * (x - x_bar);.

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PR created automatically by Jules for task 6893756791363604159 started by @tsainez

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