pmem: fix example

[gsexton]

Fixes #2

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.2%. Comparing base (ad2a966) to head (f3612ea).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main     #66   +/-   ##
=====================================
  Coverage   27.2%   27.2%           
=====================================
  Files         96      96           
  Lines      11822   11822           
=====================================
  Hits        3220    3220           
  Misses      8467    8467           
  Partials     135     135           

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[maruel]

Thanks!