Update comment for "unique-string"

[DaniPopes]

String tables are now profile-wide instead of thread-local.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.64%. Comparing base (1a808fe) to head (2fcb466).
⚠️ Report is 35 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5741   +/-   ##
=======================================
  Coverage   85.64%   85.64%           
=======================================
  Files         313      313           
  Lines       31013    31013           
  Branches     8535     8449   -86     
=======================================
  Hits        26562    26562           
  Misses       4021     4021           
  Partials      430      430           

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