CommandLine.h: fix typo

[tdp2110]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.76%. Comparing base (70c602e) to head (70e2790).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #902   +/-   ##
=======================================
  Coverage   93.76%   93.76%           
=======================================
  Files         189      189           
  Lines       47057    47094   +37     
=======================================
+ Hits        44125    44160   +35     
- Misses       2932     2934    +2     

Files	Coverage Δ
include/slang/util/CommandLine.h	100.00% <ø> (ø)

... and 2 files with indirect coverage changes

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